日期：2012年6月8日

efficiency of top rated led grow lights

LEDs, simple to understand, is the semiconductor light-emitting diode, is the world’s most advanced solid-state lighting technology. LED lights (top rated led grow lights) are not the old faces of the lamp filament bulb, but the material on the semiconductor chip solid state light source. It uses the electron mobility to light, directly convert electrical energy into light energy. Therefore, the power consumption of the LED is much lower with longer  life.

efficiency of top rated led grow lightsMany energy-saving lamps contain mercury and other harmful to the environment, the lamp scrapped if people thrown away, prone to energy-saving environmentally friendly. Such as LED semiconductor solid state light source and fluorescent technology is essentially different from the semiconductor lighting is a cold light source, do not need to inflate, no glass enclosure, do not add mercury to the use of the process from the production process until the end of life can be described as full non-polluting. In addition, LED High Bay lighting (top rated led grow lights) with good color, no flicker, soft lighting and other features.

It is understood that the latest U.S. Congress passed the Energy Act set out the schedule of phase out traditional light bulbs, while the EU market no longer sell incandescent EU countries not only to compensate for the R & D cost, long-life energy-saving lamp enterprises , but also to compensate for the needy families to purchase energy-saving lamps. LED-based lighting (top rated led grow lights) technology developed by the performance of the lamps is expected to improve in the next 10 years, more than 1 to 2 times.

The performance of the light source, energy efficiency, you can use its power and it generates the ratio of brightness between the two to measure lumens / watt (lm / W) to represent. An ordinary Philips 60W frosted incandescent lamp can produce 890 lumens of brightness, so the energy efficiency of the light source is 15.8lm / W. Depending on the bulb package type, the actual performance of the lighting device may appear to fall significantly. For example, if a standard incandescent light on a recessed light, a mirror reflection light, then the loss of the mirror, we can only get 50% of the lighting efficiency.The energy efficiency of the entire lighting device becomes 7.5lm / W.

Introductions of LED testing methods (2)

Using integrating method, LED lighting sources will automatically absorb rays, affecting the final results. In order to remove this influence, technicians need to use auxiliary lamps. Once obtained the luminous flux, we can use it to get the lighting efficiency of LED Lights. Testing methods for radiation flux and radiation efficiency are quite similar to luminous flux and lighting efficiency.

Using integrating method, LED lighting sources will automatically absorb rays, affecting the final results.

Light intensity and light distribution are two relatively complicated compare with other LED testing methods. Spot lighting sources have even light distribution in space. Sensors in different distances and using different apertures will have same results. However, the light distribution of LED STREET LIGHT is uneven. Measuring results will be various depending on measuring distances and diameters of apertures. Standard CIE-127 gives out a series of reference parameters in different measuring conditions.

The spectral parameters include peak wavelength, bandwidth and spectrum power distribution, etc. signal light LED only has one wavelength (spectral properties can only be presented by peak wavelength and bandwidth), while white LED spectrum is a combination of multicolored rays (spectral properties can only be presented by power distribution). We can also calculate color parameters though the LED spectrum power distribution. LED spectrum power distribution can be obtained though spectrophotometers, measuring various rays separately.

 

Switching feature of LED Products can be defined as the optical/electrical/color changing properties at the moment of power charge and power lose. Through them we can obtain the working conditions and physical attributes at these moments, helping us to learn the damages caused by opening/closing the switch to LEDs. Designers also can improve driver module though this parameters.

 

Color properties of LEDs include chromaticity coordinates, dominant wavelength, color purity, color temperature and CRI, etc. Color properties are rather important for white LEDs. Currently, there are two LED testing methods for color properties: Spectrophotometry and Integration. Spectrophotometry can analyze the LED spectral power distribution by using monochromator, then obtain the corresponding color parameters though Chroma Weighting Function. Integration method directly measure chromaticity in the use of specific filters along with photo detectors. Spectrophotometry is more accurate and more complicated than Integration method. Both of them need to measure color parameters with the aid of high-precision instruments. Scientists are looking for cheaper and more accurate methods.

 

track led lighting for car lights

As we all know LED reading lights (track led lighting) interior lighting almost  don’t produce any heat in the vehicle while driving, so in the future, maybe it would reduce at all possible incidents, thereby reducing the serious security risks. Compared with LED lamp life of up to 50,000 to 100,000 hours, 5-10 years, the general life of the vehicle may need to replace. LED lighting can directly convert electrical energy into light energy, fully able to meet the needs of environmental protection and energy saving.

Ordinary incandescent bulbs start a long time, usually in the 100-300 ms, while the LED  (track led lighting) start-up time is only tens nanoseconds. Even the manual mirrors, inside the structure is not too small, triangular bracket, the upper and lower frames, lenses, rotating body, etc. The back of the lens is a sunken black plastic fixed board, be careful when removing. The first to knock out a cavity on the surface of a small branch of the screwdriver and repeatedly rotating down the drill if the drill is more easy way, a good amount of LED High bay circle size, select the appropriate drill bit, dug holes.

track led lighting for car lights

Rearview mirror combination, in accordance with the demolition program will be loaded carriage return. Rearview mirror prone to wind noise at high speed, so you can cut a thin piece of soft rubber, folder lock back into the plane, you can reduce the noise generated. If we use the meter or circuit diagram, the positively charged side of the direction of the lamp to find out, while the negatively charged side of the LED  (track led lighting) is fixed in the nearest body screws.  Direction of light positively charged side LED positively charged side of the wire welding is fixed and you’re done, put the heat shrink tube. Cf before and after the modification of the direction of light, will connect the LED lights and indicators, so after playing the direction of light, will follow the light of the LED lights on the rear view mirror!

In a word, track led lighting for car lights are the future selections for LED lighting use.

Introductions of LED testing methods (1)

LED Street Light has been widely used in industrial area, commercial area and residential area. Lacking of an identical standard in LED testing methods is always the biggest problem for LED industry. Once promoting a new product, manufacturers can only set the parameters though some theoretic values. The most common example is the working time. Most of product specifications will set this parameter as 50000 hours. As a matter of fact, this is a theoretic value rather than testing result, calculated though another parameter (light attenuation) in ideal conditions. In practices, it is impossible for any LED products to constantly work for nearly 6 years without any defects. LED manufacturers and research institutions have a lot of disagreements in setting parameters. Customers often complained that their LED products cannot work in the described conditions (insufficient light intensity, higher temperature). This situation, to a large extent, restricted the development of domestic LED industry. In following sections, we are going to discuss some international standards for LED testing methods: electrical property, optical property, switching feature, color property, thermal property and reliability.

 

Electrical Property: LED is a kind of uni-polar PN junction diode. The voltage-current characteristic can be divided into two parts: forward bias and backward bias. Thus electrical properties of LED high bay include maximum forward current, maximum forward voltage, backward current, backward voltage. LEDs must work under a normal current (theoretically 20mA). We can also obtained maximum working power tough these electrical properties. LED electrical properties should be measured under constant voltage and constant current, by using multimeter.

LED has been widely used in industrial area, commercial area and residential area. Lacking of an identical standard in LED testing methods is always the biggest problem for LED industry.

Optical property: similar to other lighting sources, LED optical properties include luminous flux, lighting efficiency, radiation flux, radiation efficiency, light intensity, light distribution and spectral parameters, etc. We will introduce the testing methods of these parameters in detail.

Luminous Flux and Lighting Efficiency: there are two different ways in measuring luminous flux: integrating sphere method and variable angle photometric method. The later is the most accurate measuring method, but costs much more time. Thus, in normal conditions, scientists and technicians tend to use integrating sphere method to measure luminous flux of LEDs. Integrating sphere method also has two different measuring structures: 1. LED is settled in the middle of the sphere; 2. LED is settled on the edge of the sphere.