High-power LED application in the lighting industry

1. LED color difference problem <br> There is basically no color difference problem in the application of a single LED, but if many LEDs are put into use together or one lamp has multiple LEDs at the same time, the color difference problem will be highlighted. Let me talk about a group of lamps. If you can see at a glance that the colors of the lights are inconsistent, I would like to make a discount when I want to have a good mood. Although LEDs are divided into eight military regions by color temperature like LUXEON, and then divided into several cells in each military region, a large range of chromatic aberrations are controlled to a certain extent, but there are still differences in the same batch of LEDs in the same color region. And this difference still can't escape the provocation of the naked eye.

2, LED insulation problem

(Insulation refers to the heat-dissipating substrate for the positive and negative electrodes of the LED) We dare not say that we are the first to find the insulation problem of LED, but at least the big-name manufacturers are surprised by our doubts. So far yet to solve the fundamental problem, just take remedial measures, such as aluminum plate to deal with insulation (initial insulation aluminum plate did not do, and now almost all do) and we may find incomprehensible. A single LED is not insulated, and the effect is small. There are problems when multiple series are connected.

3, LED anti-pulse problem

This problem is still controversial with the manufacturer. It does exist in my practical application. The main reaction is on the cold pulse, that is, at the moment of power-on, a few LEDs are broken or broken at the moment of cold power-on. I don't think it's caused by static electricity or high voltage (the starting voltage is in range).

4, LED lighting angle problem

Since the LED lens packages of different manufacturers are different, even if they are the same illumination angle (nominal angle), the effect is not the same, making the selection of the concentrator difficult and difficult to use.

5, hidden dangers of LED blindness

The LED lighting point is too concentrated to make the center point super bright , so it is easy to hurt people's eyes. Although some lighting manufacturers are making efforts in this regard, due to the lag of regulations, it can only be a moral issue for people.

6, LED fever problem

In theory, LEDs don't heat very much, but because of the immature technology, LED fever is well known, I don't want to say more.

7, LED efficiency is low (luminosity)

At present, the LED's electrical conversion efficiency is too low (due to the lack of instrument testing , dare not give specific data).

8, LED brightness is insufficient

Insufficient brightness makes LEDs only play a supporting role in the lighting industry, mainly for decoration.

9, LED light decay and life

Currently the mainland or Taiwan produced by the LED light failure and serious life issues, without further ado, big-name manufacturers such as LUXEON nominal 100,000 hours, I am afraid only of their own mental clarity, plus cooling solution is good or bad, drive aspects The matching may affect the light decay and life of the LED, so 100,000 hours is just a selling point!

10, LED drive power problem

At present, most of the drive lines are borrowed from the switching power supply . Of course, there are also very small numbers of lines that are specifically used for LED driving, but the effect is basically the same. Since the LEDs need to be driven by DC, constant current control is adopted, which makes the driving lines quite large. Can not be compared with the electronic transformer, and the efficiency is relatively low, reaching 80% is not bad (single can not reach). In addition, in order to pursue applicability, the manufacturer claims that a driver can take ten or so casually (one, two, ..... can be), in fact, this is a misunderstanding, although it is a constant current, too high The initial voltage tends to kill the LED in an instant.

11, limited LED modeling

Due to the characteristics of LED single-sided illumination, the shape of LED lamps is limited.

12, LED unit price is too high

An imported 1W-3W LED is about 3 US dollars, and more than 10 pieces of domestically produced (poor quality, no intellectual property rights). A 6 LED or so left and right lamps are sold to consumers, almost 1000 yuan RMB. I would like to ask if you want to buy a color TV or buy a light fixture.

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