The light source always are several LED chips, but it has a distance between these LED chips, so according to the different lighting intensity on different position of plate, there are some light spots occurring on the plate. It also is an important problem for LED panel light industry, then how to resolve the light spot on the LED pane light ?

1. If you want to settle the problem of light spot, the key technology is to control the luminance uniformity. Generally speaking, in order to enhance the luminance uniformity, the thickness of cavity must be increased for increasing the lighting distance and achieving the best light mixing, but which will make the lamp with a bigger thickness and create larger lighting failure.

2. Using the diffusion plate HT80-M to spread the range of electric light source. The principle is ensuring there are some mixing between the larger diffusion round lighting spot, so that the lamp can achieve uniformity lighting. Therefore, when we talk about how to settle about light spot for back lit light LED panel light, we should consider below three points:

a. To choose a suitable LED chip. Different LED chip form a different light spot on the diffusion plate, so you should try your best to select a LED chip with big lighting angle.

b. The distance between LED chip. In terms of theory, smaller distance between LEDs is better, because smaller distance between LEDs means smaller distance between diffusion plate, but too small distance of LED will cause high power consumption of the whole lamp, thus it is important to choose a suitable distance between LED chip to ensure a suitable power consumption. In other hand, select a right position to put down the LED chip is also important, the common ways to arrange the LED are square, rectangular, equilateral triangle, the principle is to make a smallest mixing area between diffusion light spot on the diffusion plate.

c. The distance between diffusion plate and LED. Smaller distance between diffusion plate and LEDs means less light failure, but it also means LED lighting spot occurring. So the quality direct light LED panel light must meet three requirements of uniformity, no light spot, less light failure.