How to choose LED eye protection classroom lights
Luminous flux is an important parameter of all lamps. The standard is defined as "the radiant flux output used to evaluate the visual characteristics of the human body specified in the international standard". For lamps, this parameter is "the sum of visible light emitted by the lamp per unit time". Unit: Lumen, symbol LM. Purchase advice: For the same type of lamp, this parameter must exceed the minimum limit, the higher the better.
1. The actual parameter that determines the quality of lighting is illuminance-"the luminous flux of visible light received per unit area". It is very complicated to derive the limit of luminous flux from the limit of this parameter. Factors such as the type, light distribution curve, installation environment, height and other factors of LED eye-protecting classroom lights need to be considered. The pit is not filled.
This is a rough reference value, standard incandescent lamp, need to read and write, 900Lm. This important parameter is usually marked in an unimportant position. Some small factories do not mark it at all, so remember its unit symbol "LM". Otherwise, you cannot recognize this parameter.
2. The power parameter is the power consumption of the lamp per hour, we all know it. The smaller the lamp, the better. Let's not talk about this. When the luminous flux meets the requirements, the smaller the power, the better. This parameter is usually very eye-catching, and sales staff will also use it to distinguish the "brightness" of lamps. The importance of this parameter is second only to luminous flux. The definition of color temperature is too complicated.
Purchasing advice: Generally speaking, the color temperature of LED lamps is better between 4000k-5000k, and the bedroom and other places that need mood and comfort should choose 2700k-3000k. The high color temperature LED lights are white, giving people the illusion of "the higher the color temperature, the brighter the light". High color temperature LED lights are harmful to blue light.
The low color temperature lamp is yellow, giving people a warm and comfortable feeling. We call the rendering of the true color of the object by the light source as the color rendering of the light source. The measured index is the color rendering index. The higher the index, the less color distortion you will see. The color rendering index of sunlight is 100. National standards stipulate that RA is greater than 80 for daily use. If you are engaged in color-related work, the color rendering index of lamps must be very high, so you can only choose incandescent lamps, even if the color rendering index of other types of lamps can reach 95, don't buy it. In fact, the lamp of life has two parts. Think of the shorter lamp as the lifetime of the whole lamp.
1. The time required for the luminous flux of the whole lamp to decrease to 70% of the initial value.
2. The time from ignition to burning of the whole lamp. It is often said in the market that the service life of LEDs is as high as 5w-10w hours, which refers to the service life. A single LED chip can be used in a normal environment, far exceeding this life span. The second test is the manufacturer's LED drive capability and cooling design capability. Purchasing advice: Choose a reliable brand manufacturer's lamps, the longer the nominal life, the better.
Due to the low power consumption of LED lights, its impact is limited. However, some salespersons often claim that the higher the PF value, the better the power saving effect and the better the quality of the lamps. This is unfounded.
