日期：2012年6月20日

The future of new led lighting will subvert the concept of the lamp

In the large-scale entered ordinary families, many people are very curious. Future LED Lights lamp would be like what it is? The United States Department of energy said: solid state lighting is 50 years in lighting field is the most disruptive innovation technology.  Many people in the industry agreed, and think that new led lighting is subversive products. It born to reform the traditional lighting. In the current exhibition, a number of innovative product LED stunning debut seems indicating a trend: lighting in the future may be rewritten lamp definition.
The future of new led lighting will subvert the concept of the lamp

For example, GE has introduced a slim, stylish Lumination Lumination Series LED lifting light this year. The design is forward-looking, its ultra-thin light guide plate and the edge set of LED technology, the new led lighting for maximum efficiency,  compared with fluorescent, it has a longer life of the slimmer, more innovative styling, enhanced dimming ability and sense of design, lighting designers and end users can also tailored. Individuality and creativity integrate home decorative lighting. OSRAM launch OLED lighting products – PirOLED, which uses five removable ORBEOS flat reflective light staggered maosaic in the double helix lampholders. It can not only create excellent visual effects, but also send a beautiful diffused light.

“Now we see most of LED lamp, LED bulb lamp in the shape of our basic and traditional fluorescent lamp bulb.  GE Asia-Pacific LED lighting products general manager Wang Jian said,  it is because the LED lighting applications has just started, mainly to replace traditional lighting for the mission. The design is similar in appearance just considering that it is convenient to replace the traditional lamp concept of idea and easily accepted by consumers. In OSRAM Wu Shenbo of  Asia-Pacific division president seems simple, actually it does not reflect the LED’s best performance and features itself if it is just according to the traditional lighting profile produced by LED replacement lamps. New led lighting is a solid adjustable light source, which should display for everyone at its most ideal state.  LED small size, low power consumption, controllability characteristics, making it the release of the designer’s imagination more than traditional lighting.

power factor of t8 high bay fixtures

LED Lights, fluorescent or incandescent lamps, we have to understand one of the important parameters – power factor (PFC).

1, power factor of LED High Bay Lights

The power factor characterizes the ability of the lamp output active power. Power is a measure of the energy transfer rate in the DC circuit voltage V and current A and the product (t8 high bay fixtures). In the exchange system is far more complex: that part of the AC current in the loop where the load does not transmit power, it is called reactance current or harmonic current, it makes multiplied by current in the power (voltage Volt Amps) is greater than the actual power.

2, the apparent power of LED Flood Lights

power factor of t8 high bay fixtures

As the product of power: AC voltage and AC current. Formula is expressed as: S = the UI. Where S is the rated output power  (t8 high bay fixtures), the unit is VA (voltammetry); U is the rated output voltage, the unit is V, 220V, 380V, etc.; I is the rated output current, the unit is A Apparent power includes two parts: the active power (P) and reactive power (Q).

(3) reactive power
Lamps and all other electronic rely on the DC voltage circuit, leaving the reactive power does not work. General users that the lamps and the like devices will require the active power, without the need for reactive power. Since the reactive power is not acting, you want it and where to use! So of course they think that the power factor is one of the lamp. Because it gives the maximum output power. However, the reality is not the case.

A lamp when the AC mains input rectifier, pulsating DC voltage, if the ripple voltage of any processing, it is provided directly to the lamp, no doubt, the circuit did not work. When the lamp  (t8 high bay fixtures) power factor close to 1, but this is what to use it. In order for the lighting circuit to work properly, must provide a smooth DC voltage. “Smoothing” must be performed by the filter capacitor connected to the lamp rectifier behind to complete. This filter is like a reservoir capacitor which must be stored a sufficient number of charge, when the gap between the half-wave rectifier circuit voltage remains uninterrupted, able to maintain a normal level.

t8 led fluorescent tube and heat sink

With global energy shortage and environmental pollution, the LED with its energy-saving and environmental features of the vast space, the application of LED light products are attracting the world’s attention in the lighting field. In general, the LED lights work stability,  no matter the quality is good or bad, and the lamp cooling is essential, the heat of the high brightness LED lamps (t8 led fluorescent tube) on the market, often using the natural cooling effect, which is not satisfactory. LED lamps, LED light source to create LEDs, thermal structure, drives, lens, so the heat is also an important part, if the LED can not be a good heat, it’s life will also be affected.

1, thermal management is the main problem in the high-brightness LED applications
P-type doping of III-nitride limited by the solubility of the Lord and hole higher than that of Mg activation energy and heat are particularly vulnerable in the p-type region; Sapphire substrates is extremely low thermal conductivity of the device thermal resistance increase, resulting in severe self-heating effect, have a devastating impact on device performance and reliability.

t8 led fluorescent tube and heat sink

2, the heat of high-brightness LED
Heat concentrated in a small size chip, the chip temperature rises, causing non-uniform distribution of heat stress, decline in the luminous efficiency and the lasing efficiency of the phosphor; the device failure rate increased exponentially when the temperature exceeds a certain value. The statistics show that the component temperature rise of 2 ° C, reliability decreased by 10%. When multiple LEDs (t8 led fluorescent tube) are densely packed composition of white light illumination system, the heat dissipation problem is more serious. Solve the problem of thermal management has become a prerequisite for high-brightness LED Street Light applications.

3, the chip size and the cooling of relations
The most direct way to improve the brightness of power LED (t8 led fluorescent tube) is to increase the input power is bound to increase the input power in order to prevent saturation of the active layer must increase the size of the pn junction. Single-tube power increases depends on the device the ability to export heat from the pn junction to maintain the existing chip material, structure, packaging technology, the current density on the chip the same and equivalent thermal conditions, a separate increase the size of the chip junction area The temperature will continue to rise.