Integrating sphere test led tube luminous flux
When using the integrating sphere to test the luminous flux of the LED tube, there are several test situations,
The first is the LED tube with the light-emitting side facing up,
The second case is that the light-emitting side of the led tube is facing down.
The third situation is that the light-emitting surface of the led tube faces the integrating sphere probe (of the baffle),
The fourth situation is that the led tube is facing the probe back,
The luminous flux in the third case is the highest,
The luminous flux in the second case is the lowest
Engineers from far away said that they tested according to the third situation
Voda’s engineers are talking about the third case test
Therefore, different LED tube placement methods result in different LED fluorescent light fluxes. Currently, it can only be tested in accordance with the requirements of the integrating sphere manufacturer. That is the third situation. So what is the reason? Just compare it. When we test the flux of ordinary fluorescent light, we directly install the glass fluorescent tube on the integrating sphere bracket. Since the light-emitting angle of the glass fluorescent lamp is 360 degrees, of course one side is directly facing the sensor head---the baffle. The other surface emits light, and its luminous flux can only reflect light through the integrating sphere and reflected to the baffle. Then, after collection and calculation, the total luminous flux will be obtained. But here is the problem. Now the LED tube emits light on one side. In fact, the LED tube has all the light emitted. Of course, it must be tested with the baffle. The other three test methods are unscientific. Especially in the second test method, the luminous flux is artificially lost, the test is inaccurate, and the tested luminous flux is the lowest. Therefore, attention must be paid.
