LED panel light luminous uniformity
Another important indicator of LED panel lights is the uniformity of their light emission. The cross-strait common standard GT004-2012 "LED panel lamps for indoor general lighting" proposes the requirement of luminance uniformity, which refers to the minimum brightness and brightness on the light-emitting surface of the lamps. The ratio of the arithmetic mean.
As an LED panel light, the unevenness of the light emission will lead to the unevenness of the panel display brightness, which will cause discomfort to the human eye. According to the requirements of GT004-2012 standard, the brightness uniformity of LED panel lamps should not be less than 0.8. The test method is mainly to select appropriate test points according to the size of the screen, and measure the brightness value of each point. It is generally believed that the uniform performance of more than 80% has little effect on the perception of the human eye.
The brightness uniformity test of flat panel lamps is the first time that the surface brightness of indoor lamps is required in the standard. It reflects the characteristic parameters of flat panel lamps and is one of the important characteristics of this type of lamps. In indoor lighting, surface-emitting lamps create a soft and simple lighting effect, which cannot be replaced by other bracket lamps or grille lamps.
In indoor lighting, fluorescent lamps with diffuser panels also have a surface luminous effect and have been used for many years, but they cannot reach the level of brightness uniformity of LED flat panel lamps.
The reason is that the fluorescent tube is an omnidirectional light source, and the optical system can no longer be adjusted to achieve better brightness uniformity, and the efficiency of the lamp is 40lm/W. The light source of LED lamps is half-space light. In the lamps, the utilization rate of light is high, the efficiency of the lamps can reach more than 80lm/W, and the brightness uniformity can reach a higher level.
The side light guide structure LED panel light is adopted, and the LED light-emitting tube is arranged on the side of the light guide plate, and the visual effect of the lamp is better. At present, most domestic manufacturers still use printed light guide plates as light guide components, and use various diffusion points of different density and size to make the light guide plates emit light uniformly, so as to obtain good lighting uniformity.
Judging from the test results, the brightness uniformity of the small-sized LED panel light is easy to meet the requirements, and even if the uniformity is a little off, the human eye is not easy to perceive it. Large-area LED panel lights sometimes have uneven brightness due to the quality of the light guide plate, and there are process reasons that cause the above-mentioned bright light bands at the incoming light, or local dark areas can be seen.
Therefore, the selection of main raw materials such as light guide plate, diffuser plate, and reflective paper should be evaluated for quality, and the raw materials should be strictly checked when entering the factory. The manufacturer should be equipped with necessary optical brightness meters and light transmittance testing instruments.
Shenzhen Benwei Lighting Technology Co., Ltd is a professional manufacturer in producing LED lighting products, Our main products T8 T5 LED Tube, LED Grow Light,Poultry LED Light,Tri-proof LED Light,LED Flood Light, LED Panel, LED Stadium Light, LED High Bay, LED Classing Room Light ,If you want to purchase a high-quality LED lighting products or have a more in-depth understanding of the application of LED lighting, please contact send us inquiry.
