作者：Blade

rgb color led in old buildings

For landscape lighting design, ancient buildings are non-renewable, reliable protection under the premise of modern lighting design and implementation. The lighting design must comply with the following principles:
1, protection and utilization principles. Ancient architectural lighting to achieve elegance to showcase its ancient buildings, reflecting the cultural and artistic connotation, and can not damage the ancient buildings, to protect and use the dual demands of the ancient buildings.
2, does not change the principle of the status quo ante of the ancient buildings. Such as more than 800 years of ancient buildings is prohibited electrical wiring.
3, according to the standard design principles. Illumination or brightness of the lighting, the light source of infrared and ultraviolet content, exposure time and light color parameters need to be in strict accordance with the standards for the design.
4, the strict management principles. Lighting Design, we must consider the lighting facilities maintenance and management methods and measures.
Before due to the limitations of the luminous efficiency and light, the lighting of ancient buildings there are a range of issues, such as:
installation of lighting fixtures. Large-volume lighting device directly fixed on the building above, not only destroyed the building structure and its daytime landscape. And no way to show the beauty of ancient buildings delicate lighting changes.

rgb color led in old buildings
b, lighting method. Long-range projection for the protection of buildings, but most of the cast light shade measures, resulting in overflow of light more to the outside of the illuminated objects, the initial estimate about 1/4 to 1/3 of the light from dissipating into the air and outside the illuminated object
, The formation of light pollution. The neglect of energy-efficient major premise.
c, the choice of lighting fixtures. Lack of
Consideration of the lighting fixtures as ultraviolet and infrared radiation, causing irreparable damage to the ancient buildings.
In ancient architectural lighting, LED display unparalleled advantages.
Accumulation of large heat safe lighting system: LED lights source power of all low-voltage drive to solve the heat dissipation problem is not easy to satisfy the requirements of fire safety.
Green lighting products: infrared and ultraviolet light, will not vandalism, while the light source does not contain mercury, will not cause environmental pollution, is a truly green lighting products. Give full play to the compact design with point lighting, surface lighting, partial lighting suitable for display in the art lighting design space is very large. Long life, up to tens of thousands of hours, low maintenance costs.
Instance – Xiangunan door walls
Overview:
Inside and outside the Xi’an ancient city wall preserved intact, the vigorous development of tourism resources, the formation of the human heritage features in East and West, North and South 24 radiation. Xi’an city wall in the Sui and Tang dynasties, “Imperial” on the site of the Ming emperor Hongwu years after eight years of expansion from our existing largest and best preserved ancient city building.

 

Xi’an city wall of Ming Dynasty Hongwu to the 6th century when the Sui and Tang imperial walls based on expansion of the formation. The ancient city wall every 120 meters there is a 12m * 20m salient known as the “enemy” Every enemy on stage has troops in fortresses one. City Siyu built turret one. East, west, south, Beiyuan the construction of the Shing Mun a, respectively, for the East the Changle door, West Andingmenwai, South Yongning door, Beian far from the door.
Outside the city were built to protect the door Urn Urn on a built tower, watchtower each one. Urn outside the inside of the moat shore Pro, has a gate control “suspension bridge” floor, an, Confucius Temple flanking City top built Kuixinglou to a surface of the top of the walls to three-brick Fuman puzzle, known as “sea TRANSACTIONS. The outer edge of the sea Fuman build crib wall and the whole city the total Duokou 5984, along the contact of the “parapet”.
This article describes the LED lighting is the south gate of landscape lighting, including the tower, gateway buildings, watchtowers, Kuixinglou and walls battlements and drainage holes. Walls on top of the building landscape lighting design:
The south gate of the ancient city wall buildings, including towers, gates, buildings and enemy units on both sides of that part of building the overall performance of the ancient Chinese architectural culture is the iconic buildings of the south gate of ancient city wall, the general features of the Department of the Qin and Han style of multi-level tower construction, brick and gray tiles, carved pillars and painted beams, although the age-old, but still kept a full roof cornices momentum imposing atmosphere.

The fifth development trends of the led lighting design industry

Take the Bird’s Nest as an example, in the initial program, the color of the design center around how to maximize use of the building itself to create the visual effects. The designers hope that the complex structure of abstract led lighting design and the Bird’s Nest sparks will build to become the world’s largest art.

led lighting design

But the function of the stadium, security of public buildings and energy-efficient cast a negative vote. Similar to the use of construction outside of the body as a carrier, the use of digital systems to do color projection, that will be building itself into a luminous body, installation of lighting equipment such costs, equipment, energy consumption and conservation is difficult, led lights pollution, heavy programs have all been cut.

In the final program, the Bird’s Nest internal functional areas and the outer wall using most conventional illuminated red light projected; illuminate the facade and left sides of the U-shaped surface with white light projection; steel between the roof of the upper and lower membrane structure and also illuminated with white light projection. Both the form and function from the inside out, nationalization of world-class architectural styles. It is very exciting.

The construction of light environment on the building is essential. No suitable light, architecture can not better perform its functions, affecting people’s work efficiency and mood. A lot of artistic effects can not be demonstrated. Light and vision is directly related to the lighting environment is also related to the performance of the indoor space and architecture modeling.

Trend: To promote the “Lighting of Economics”

In fact, the led lighting design is a management, the Yuan Zongnan to the majority of designers to make this comment:

Designers need to know the rational led lighting design, control the lighting changes in the flow of more and less hours, minutes. More could be considered light, the light concentrated in this period between seven to eight people. With the reduction of the flow of  people, the lights can be reduced to 30% or 20%.    It can not only save energy, protect the quality of sleeping, but also shows the transformation of beauty.

The fourth development trends of the led lighting design industry

Trend: City landmark humane care of the lighting

For the chief designer of contemporary cities, they have to build a landmark building, to create the boom of the city’s calling card, said by Zhimei who participate in and presided over too much landmark led lighting design.

Skyscrapers can not be advertised as a city flag just because of its scale, architectural features. It need remarkable and symbolic meanings design. Lighting, instead of telling the exclusive story of the building, convey the humane care of the city.

led lighting design

So, how to enlighten the iconic building?

Throughout the night view of the country’s premier landmark design effect, the chief designer of Zhimei to see that the CCTV new site building is a good case: its grotesque irregular shape for architectural lighting, lighting installation has brought a lot of fresh challenges. In the use of the advantages of its own structure, get rid of some dead ends, designers lit up with daytime look, showing the school of simplicity, gentle, elegant, subtle solemn beauty, not only heal lead to one put into use before boos, including but not exposed is designed to also happens to coincide with the building image.

An increasing number of landmark building, due to the careful design of the lighting project, which is more attractive. In future led lighting design, the designer is not thinking about the projected intensity of the light projection of the way and let the light guide, carve out the unique charm of the building, allowed freedom in the urban night sky flying humane feelings.

Trend: Light design need to remember function first

Lighting objects vary widely,  different buildings require different lighting styles, different functions require appropriate lighting assistant to achieve. Gorgeous atmosphere of the Bird’s Nest Stadium, the Shanghai World Expo modern Famen stupa solemn and dignified, colorful Guangzhou waistline … whether LED lights or traditional fixtures, how to use and choose, the only criterion is the function first.

Year-round to reach the major domestic and international engineering, the chief designer of the Zhimei see well aware of how to find the optimal balance of customer demand and the actual operation. The function of art, the persistence of functional he is committed to the pursuit of the effect.

rgb led color and car light

LED For the consumer, has been widely used in the car, depending on the performance requirements to select the appropriate LED products, LED compared to traditional light sources in addition to the appearance different, the performance output and optical output is also not the same optical design and thermal design is different from the traditional lighting of the design concept is applied to the headlamp will face. However, because of its different from the characteristics of traditional light sources, and to successfully integrate with the body to overcome the technical problems for the models to create a new design concept.

LED has been widely used in interior lighting or instructions with light, we can see from Figure 1, from the dashboard of the car lights, car dome light, make-up lights, welcome light to the vehicle’s tail lights, front and rear turn signals. down lights, third brake lights, and other related applications can see the LED.

rgb led color and car light

From the historical point of view of LED applications, as early as 1992 when the LED used in the precedent for the third brake light; 2000 is further applied to taillights, turn signals and brake lights; take the lead in the 2002 Audi A8 LED light source placed in front lamps as daytime running lights, turn on the imagination of designers and engineers in the front lamps. Can be seen on the many international auto show concept car, the LED lights as a headlight source.

rgb led color and car light

LED inherent small size advantage, applied to the front lamps may reduce the volume of the entire group of lamps, and further to give up valuable space for engines and other related equipment existing halogen bulb or discharge lamp design lamps with a total length 300mm, in concept car design, LED lighting is only 125mm long. By the advantages of small size, with the design of a variety of different design, and then for the body shape to create a different visual perception, escape from the circular design of the traditional lamp.

Different as the application level, the depot also use the LED light source package corresponding to the different environmental requirements, according to the different needs of brightness can be simply divided into two directions with lighting and projection in three different Indication light source visible in the third brake light, rear light clusters (taillights, brake lights, turn signals, etc.), side lights, low lumens light output, low power required of about 70mW ~ 200mW, the heat generated package less affected body, so the package will ignore the impact of this heat, and direct use of the resin material coated to the package as a whole, the resin with low thermal conductivity (W / mK), so its thermal resistance heat is not easy to rise to 50 ~ 200K / W; illumination light source package power relative to the higher brightness of the daytime running lights, fog lights, can be applied to the directions of the light source used class of products, can also be used, before the direction of light, but also because of the loss of power increase (power about 1 ~ 5W), the thermal part can not, as indication light does not consider heat issues still need to use a piece of metal will heat export, in addition to the resin material package in order to maintain the optical efficiency , maintained at below 15K / W thermal resistance; and projection light source, light package brightness needs, the main lighting system (far lights, low beam, fog lights, etc.) before their application, and its single package required 4W or more, while less than 5K / W thermal resistance on the need to ensure that the cooling capacity to maintain the high temperatures of the engine room, and maintain the efficiency of the light output in the range of available

Different level, the total brightness needs about 80 lumens of brightness to the interior lighting is generally used in surface mount (SMT) package, single package about 2 lumens of output, efficiency up to 15 ~~ 20lm / W. About 30lm the brightness of the third brake light, is generally used in the artillery-type package structure (φ = 5mm), the brightness of the single package about 4 lumens, the efficiency of up to 20 ~~ 40lm / W.

rgb led colors and current driver design

This article discusses a simple circuit to adjust the high-brightness LED drive current, the circuit uses non-customized, highly integrated step-down switching regulator (MAX5035), the ability to accurately control the flow of LED current. 6.5V to 76V wide input voltage range, the MAX5035 DC / DC converter to maintain a fixed frequency of 125kHz, and is the ideal choice for automotive applications. The brightness control analog (linear regulator) or low duty cycle (PWM) to achieve.
The high brightness LED lights development background

rgb led colors and current driver design

In recent years, high-brightness LED (HB LED) as light sources in a variety of lighting systems increasingly favored, which is due to the high brightness LED with a high degree of reliability, service life can reach dozens or even tens of thousands of hours, than the traditional incandescent the life of the lamp or halogen several orders of magnitude higher. Based on this advantage, high-brightness LEDs in automotive lighting, public marked with the widely used signal signs and architectural lighting.

The high brightness LED is specially treated PN junction semiconductor devices, the forward bias may issue a white, red, green or blue (may also have other colors of light). Show as a PN junction VI characteristics similar to conventional diode, but with higher junction voltage drop. The forward voltage of VF blue LED (red LED 2.5V to 4.5V), the flow through the LED current is very small; forward voltage of the VF, the current will increase rapidly (the same as the traditional diode). Therefore, we must adopt measures to limit the current rise in limiting to prevent damage to the LED. There are three basic ways of limiting, were compared in Table 1 of these three ways:

Based on a fixed frequency, highly integrated PWM switching converter MAX5035 high-brightness LED power supply schematic, the output current up to 1A. Another similar device MAX5033 output current can reach 500mA. The inductor-based buck regulator can accurately control the flow through the LED (or several series of the current of the LED, the total voltage is 12V). The MAX5035’s switching frequency of 125kHz, input voltage range up to 76V (need to use a higher rated voltage of the input capacitor and diode). This circuit can be controlled in a wide input voltage range and to maintain a constant LED current. Table 2 summarizes the design specifications of the circuit.

The circuit in Figure 1 in the control side the role of a voltage to adjust the LED current. Figure 3 shows the efficiency of the control architecture.

Control voltage and three parallel galvanometer voltage common role in resistance to the feedback (FB) pin of the IC. IC’s internal control loop the FB pin voltage is maintained at about 1.22V, the control voltage and current detection voltage must be kept at 1.22V (set by the resistors R1 and R5), the higher the control voltage will produce more small current.

The following equation applies to this exception can also be used to design the output current and control voltage:

Of which: VRFF = 1.22V, RSENSE R2, R3 and R4 shunt resistor (5Ω).

In many cases, the use of low frequency (50Hz to 200Hz) PWM way to adjust the LED current is very convenient to adjust the brightness by controlling the pulse width. LED during each pulse to maintain the same brightness, naked eye can detect short-term brightness variations, but the method has the advantage of this regulation is that the spectrum remains unchanged, the use of amplitude modulation spectrum will change with the change of the flow through the LED current .

rgb led downlight and balance point

Since the sixties of the last century, the first commercially available LED lights market, LED lighting industry has been applied 40 years of industry on the middle and lower reaches has formed a relatively complete industrial chain, LED is used in increasingly more industry, this article from the following four aspects to the macro described the advantages of LED lighting compared to other light sources in the significance of indoor applications, LED light source in the development and promotion of the range of applications in the field of indoor lighting, and LED interior lighting products direction.

rgb led downlight and balance point

In the field of indoor lighting, the main applications of traditional light sources in general, including incandescent, halogen, fluorescent lamps, PAR lamps, metal halide lamp. This type of light source power consumption of a single color and control, and light thermal radiation, in some special places by certain limitations. The LED light source has a full color easy to control, energy saving and environmental protection advantages, to create a light environment can not be replaced by other conventional light sources, high-quality, fully meet the market demand for upscale interiors, mood lighting and lighting design to the interior space of the new way of thinking. In particular, the emergence of high-power LED LED lighting in the field of interior lighting find a breakthrough to accelerate the application of LED in the field of interior lighting.

When it comes to LED applications, I can not talk about some of the advantages of LEDs compared to conventional light sources. These advantages, it is the LED mood lighting of indoor commercial area of ​​application of thin flat point.

LED green lighting products, known as the 21st century is now virtually the entire world’s eyes are focused on this new type of light source, compared with conventional light sources, has incomparable advantages:

1, high purity, bright rich colors. LED products covering almost the entire visible spectral range, and high color purity. The traditional way is to get the color of light to incandescent lamp and filters greatly reduce the luminous efficiency;

2, and long life. The actual LED life over 50,000 hours, or even several times for general light source several times;

3, light source, no mercury, no ultraviolet beam. The LED is a solid light source, green, especially suitable for professional place for perfume shops, jewelry stores, museums, art galleries, which can meet the special requirements of the lighting of the display of goods;

4, light-emitting solid, good seismic performance, solid and reliable;

5, energy saving, economical, maintenance-free;

6, the dynamic color control, brightness adjustable LED combination of the three primary colors can be used PWM to achieve a change in color

7, LED strong light direction, the luminous flux of high utilization, small size, easy-to-LED lighting design and control of light intensity distribution;

LED can be DC low voltage power supply, safe and reliable;

9, LED is not a start-up temperature limit can be instant start, generally a few ms, and can reach instantaneous full luminous flux output.

Then talk about the applications of LED indoor lighting project;

rgb led flashlight and Xenon lamp

White LED Driver drive power limited xenon lamp flash to illuminate the shooting scene provides a cost-effective choice. This article describes the basic concept of xenon lamp, and the details of a typical low-power based on the ON Semiconductor NCP5007 chip, low-cost flash drive circuit design.

rgb led flashlight and Xenon lamp

Digital camera and is equipped with camera phones have new product into a mainstream product, these products within the digital image sensor based on CCD or CMOS technology. Able to support the image sensor in low light conditions, the flash circuit became necessary solutions for digital cameras, camera phones are becoming more common. Satisfy the flash requirements of the main light source is a xenon bulb and now the new high-brightness white LED lights.

The main advantage of the xenon lamp flash pulse generated by high power light output, while the advantages of the LED program is a relatively small size and thin, and longer conduction time in the video capture, the light output with the xenon lamp is only average compared. In particular, the xenon lamp flash pulse is very short, to enable the camera to capture photos made into a static picture. They need a special drive to produce high pressure and high energy storage capacitor to store electrical energy.

We found that the white LED panel driver to drive power limited xenon lamp flash to illuminate the shooting scene provides a cost-effective choice. This article describes the basic concepts of the xenon lamp, and details a typical low power / low-cost flash applications.

The xenon lamp has a glass enclosure at each end of an electrode, filled with low pressure rare gas mixtures. In the steady state, as shown in Figure 1, the voltage on the electrode is set lower than the trigger voltage. At this point, no current flows through, and the system remained stable until the trigger voltage applied to the third electrode. For the considered low-power light, this high-voltage pulse in the 1kV range, it comes with a small core transformer by a sudden discharge of the capacitor C2 is triggered.

The gas mixture is excited by plasma flash. For consumer applications, flash duration is 2ms. Flash type, the energy stored in the capacitor C1 can be as low as 1 joule (small camera), up to several thousand joules (professional application). Flash energy consumption shown in Equation 1:
Depending on the type of xenon lamp, the capacitor charging voltage is basically for 160V to 600V. The energy of low-power hand-held camera needs no more than a few joules, and the output voltage range of 160 to 250V. Higher voltages can be seen generally in a professional studio equipment used.
In addition to the DC voltage, high voltage pulse to excite the plasma in the bulb, high-intensity arc generated between both ends of the electrodes. Pulse amplitude depends on the type of lamp used in the system, ranging from lower 1.6kV to 10kV. Micro-xenon lamp is applied to the third external electrode of the lamp 1.6kV/5μs pulse triggers the pulse shown in Figure 2 for pulse transformer and high voltage capacitor connected arising. Charge the capacitor to the flash dc voltage (200V), and suddenly after the trigger button S1 to the pulse transformer primary side discharge. From the secondary side of high pressure is applied to the outer surface on the bulb, the flash is excited.
The main advantage of this concept is the light output and pulse duration is very short, quick photographs moving subject frozen at some point. The disadvantage of this design is the size of the storage capacitor, you need to board a higher voltage, and during filming capacitors need to be recharged (consumer applications, the charging time of 5-10 seconds).
According to the sensitivity of the imager and lens aperture in the general environment for consumer applications, a relatively small capacitance is sufficient to photograph in bright pictures. Therefore, you can use a simple converter to the battery voltage up to 200V voltage of the low-pressure xenon lamp required.

rgb led flood lights and white led driver

 

General white LED current is about 20mA, but the high brightness LED 200 to 300mA current. If your product requires three to four high-brightness white LED; brightness average general practice is to string them connected together. On the market, most of the white LED driver chip can only drive 20mA. Hit a series high current LED applications will have to think of other ways. Intersil’s EL7516 is a typical step-up chip. This chip operates at 1.2MHz fixed-frequency PWM mode, built-in 1.5A, 200mΩ MOSFETs. Figure 1 shows the EL7516 a typical circuit. DC-DC boost the role of EL7516 will be 2.7 ~ 5.5V input into a constant voltage of 12V. General PWM control chip, the FB pin is connected to the error amplifier is compared with 1.3V. R1, R2 resistor value is selected to set the output voltage.

With the development of white LED lights, it’s more widely applied. In the past, the white LED is the most common application is as a small-size color LCD backlight. White LED brightness increase, its application has spread to other areas; such as a flashlight or cell phone camera auxiliary lighting. The following describes a general boost chip to drive high current LEDs efficient circuit.

EL7516 lines of constant pressure to change the drive LED constant current circuit is very simple. Shown in Figure 2, the FB pin of R1 replaced by LED grow lights, change R2 can adjust the current through the LED. R2 values ​​selected from the following formula: R2 = VFB / IledVFB FB pin voltage; that 1.3VIled is the current through the LED

For example, if the requirements of Iled 300mA; then R2 needs to 4.3Ω.

On the circuit of Figure 3, the biggest drawback is the loss of R2. R2 by 300mA, the resistance of the power consumption is close to 0.39W. Such a great power not only affect the efficiency, we also need to use the relatively large size of the resistance to accept 0.39W heat. In general, these applications are battery powered. Efficiency and line PCB space requirements are more stringent, now let us look at how to improve the efficiency of this line.

egardless of the circuit changes how EL7516 will adjust the duty cycle so that the FB voltage to maintain 1.3V. The assumption D1 positive voltage drop is 0.6V, the voltage drop across R2 is about 0.7V. To maintain a 300mA LED current, R2 can be used to 2.3Ω. R2 power consumption also dropped from the original 0.39W 0.21W. Although the power consumption has been reduced, but R2 have to use a half-watt resistor to achieve this line.

rgb led flood lights and white led driver

A cheap TL431 added to the circuit as a 2.5V reference. As mentioned earlier, the EL7516 will remain FB 1.3V, the current through R4 is: (2.5-1.3) / 20k = 60uA. FB is a high-impedance pins, we assume that this 60? A full inflow of R5 and made the same 1.2V voltage drop. 0.1V, the rest of the R2 to complete. In order to facilitate the purchase, R2 is selected as 0.39Ω. So the current through the LED tube is about: 0.1/0.39 = 255mA. R2, power consumption is significantly reduced to: 0.1X0.255 = 26mW.

rgb led high power and led car use

The basic use of the controller reduces the cost of the car displays, signal and lighting electronic equipment. Switch adjustment circuit in the highest efficiency light LED to control the brightness of the lights.

Recently, LED tube has been replaced by low-voltage halogen technology, widely used in the car for general lighting. Design engineers have long life and low operating DC voltage LED lighting two advantages quickly gave approval.

On the other hand, in order to make these new LED technology to develop, you need to use more complex, more expensive vehicle electronic control system. The emergence of new ultra low-end 8-bit microcontroller (MCU), allowing design engineers can significantly reduce the cost and complexity of the system, use this alternative lighting solutions to be able to be profitable.

Due to the use of low-end MCU, high-brightness LED tunnel (HBLED) has developed many new applications, to continue to attract more users. New input, the HBLED including: monitor, car signs, lights, mobile devices and lighting equipment.

Overall, the LED has a nonlinear volt-ampere characteristic, the need for limiting the control of power consumption and light output of these two important factors. Power consumption and light output depends on the current drive the HBLED the ideal power is the constant current source. The high brightness LED lights, standard LED in its output power. Traditional LED output power is typically limited to below 50mW, but HBLED is able to provide 1-5W of output power.

Want to get the constant current source in many different ways, such as the use of series resistors, linear current source or switching regulator. The use of the switching regulator is the most common energy-saving solution. Switching regulator to cut off the input voltage, the duty cycle to control the average current, in order to achieve its current control – when the load requires a higher load current, the circuit connected to the time extension to fit the load current changes .

The HBLED the current is generated by the average power stored in the inductor L within. Switch is closed, the inductor will store energy as much as possible, the current flowing through the HBLED will be enhanced until it reaches the maximum or switch off. Then, when the switch is turned off, the energy stored in the inductor will provide HBLED current. This current will gradually weaken until you reach the minimum or switch is again closed.

rgb led high power and led car use

Current control to solve the problem becomes very simple, based on the the HBLED above the MCU controller dimming. Right the HBLED to implement dimming There are many different techniques, some of which may include the patent issues. Under any conditions, the dimmer on the same basis, namely: fully open in the HBLED the normal operating current HBLED period of time, and then completely to the continued closure of the period of time. Periodically at a faster rate to complete the action (the human eye can see) to give the impression HBLED light levels darken. The three techniques most commonly used are: pulse width modulation (PWM), frequency modulation and the bit angle modulation.

rgb led lamps and super bright led

Invented in the 1960s, it is the use of electrons and holes in semiconductor materials combined with each other and release energy, the energy band (Energy Gat,) rank changes, they release energy to light-emitting display. The LED has a small size, long life, low driving voltage, low power consumption, fast reaction rate, good shock resistance, it is widely used in the field of signal indicator, digital display. As technology continues to progress the development of ultra-bright LED has been successful, especially in the successful development of white LED lights, making it more and more used in the lantern decoration, and even the lighting in the area.

rgb led lamps and super bright led

l super bright LED features

Compared with the traditional lighting, ultra-bright LED has the following advantages:

1) long life, reliability and durability, very low maintenance costs LED can be used continuously 105h, 100 times longer than ordinary incandescent bulbs;

2) high-efficiency can already reach 201m / w. Expected by 2005 will reach 501m / W [1], the LED) the spectrum almost all concentrated in the visible light spectrum, and its luminous efficiency up to 80% ~ 90
%, LED energy-saving lamp energy saving but also 1/4;

3) color, light color simple example, 12 inches of red traffic lights, it uses low-efficiency 140W incandescent lamp as a light source, generated by 2000lm white The red filter, the light loss of 90%, leaving only under 2001m of red, 18 red LED light source lamp used in Lumileds Lighting Company, including circuit losses, consumes only 14W, and can produce the same luminous efficiency;

4) light speed fast car lights is an important area of ​​application of the LED light source, LED response speed (ns level), the high level LED brake lights, installed in the car can reduce rear-end accidents.

Bright LED in recent years has been in a car near light applications, such as the German Audi Audi A86.O, Italy Fioravanti concept car introduced at the 2003 Geneva Motor Show, the Yak, the U.S. Ford Motor Company recently at the Detroit Motor Show launched ModEL U are beginning to be bright LED used in the design of the headlamps.

Despite the ultra-bright LED has many advantages, but there are still the following shortcomings:

1) low power single LED tube market power generally in 5W following, not yet more high-power LED, which is the biggest bottleneck of LED difficult to become a lighting preferred;

2) the need to strictly control the temperature LED is a semiconductor material, with the diode as the PN junction diode highlight the power is relatively large, so the same with the power semiconductor devices, need to consider the problem of heat dissipation, junction temperature is too high will directly affect the LED life, and increased LED light decline in serious cases, the LED burned out;

3) the high price in addition to low power, the price is the main factor of the LED is difficult to become a lighting Although the LED has been most understanding, most people optimistic, but its high price is difficult to be accepted by consumers, the current single yellow LED about O. 6 yuan / month, green and blue single LED at about 1.8 yuan / the price of the white LED of about 2.2 to 5.5 yuan / month; dozens of single LED portfolio, the cost will greatly increase such as an LED installed in lawn lamp, the unit price is equivalent to general lawn several times, the LED to become a mainstream light source of lighting in the future, it must be moving in the direction of the large lumen, the cost of it be possible to reduce the market possible breakthrough.

Characteristics of the two super bright LED flood lights

HPWA-xH00 Lumileds Lighting Company, a super bright LED, it as an example the analysis of ultra-bright LED features. Figure 1 is the forward voltage drop (VF) and the forward current (IF) curve, the curve shows that when the forward voltage exceeds a certain threshold (about 2V), commonly referred to as the turn-on voltage can be approximated that , IF and VF is proportional to. Table 1 shows the electrical characteristics of the major super bright LED. Table 1 shows, the super bright LED’s highest IF up to 1A, VF is usually 3 ~~ 4V.