High-power LED in the application of the problem

1, LED color difference problem Single LED application, there is basically no color problem, but if you put a lot of LED together to use or say that a lamp has more than one LED at the same time, the color difference problem will be highlighted. Let's start with a group of lamps. If one sees inconsistent colors of light, even though LUXEON divides LEDs into eight military regions by color temperature, and then divides them into several communities in each military region, a large range of color differences is performed to a certain extent. Control, but there are still differences in the same LED in the same color area, and this difference still can't escape the provocation of the naked eye.

2, LED insulation problem (herein refers to the insulation of the heat sink substrate for the LED's positive and negative terms) can not say that we are the first to find the LED insulation problem, but at least the big manufacturers were surprised by our doubts. Until now, it has not yet solved the fundamental problem, but only to take remedial measures, such as using aluminum substrates to handle insulation (the original aluminum substrate was not insulated, and almost all of them are now done), which may seem incomprehensible to everyone. A single LED is not insulated and the effect is not significant. There are problems when multiple cells are connected in series.

3, LED anti-pulse problem This issue is still controversial with the manufacturer, in my actual application does exist, the main reaction in the cold pulse, that is, the moment of power-on, a few LED in the cold state of the instant power-on or break down . I don't think it's caused by static electricity or high voltage (startup voltage is in range).

4, LED light angle problem Because each manufacturer's LED lens package is not the same even if the same light angle (nominal angle), the effect is not the same, making the selection of the light shield is difficult, still can not be universal.

5, LED potential blinding potential LED light emitting point is too concentrated so that the center point brightness is super strong, so it is easy to hurt the eyes of people, although some lighting (lighting decoration renderings) manufacturers in this effort, but due to regulations Lag, it can only be a moral issue for people.

6, LED fever problem In theory, LED is not how hot, but due to the current technology is not mature, LED heat is known, I do not want to say more.

7, LED efficiency is low (luminous rate)

At present, the LED's electrical conversion efficiency is too low (because there is no instrument testing, it does not dare to give specific data).

8, LED brightness is insufficient brightness, LED current in the lighting industry can only serve as a supporting role, mainly used for decoration 9, LED light failure and the life of the current domestic or Taiwanese companies produce LED light failure and life problems are more serious, not much It is said that the big manufacturers such as LUXEON nominal 100,000 hours, I am afraid that only their own psychological clarity, coupled with good or bad thermal solution, the driver's matching may affect the LED's light failure and life, so 100,000 hours is only a Sell ​​it!

10, LED drive power problems Most of the current drive lines are borrowed from the switching power supply, of course, there are a few decimal lines is dedicated to the LED drive, but the effect is basically the same, because the LED needs to be driven by DC, to take constant current control This makes the drive circuit very large and can not be compared with the electronic transformer, and the efficiency is relatively low, reaching 80% to be good (single not reach). In addition, for the pursuit of applicability, manufacturers claim that a driver can bring up to ten random chips (one, two,...), which is actually a misunderstanding, although it is a constant current, an excessively high starting voltage. LED will often die in an instant.

11, LED shape limited due to the characteristics of LED single-sided light, making the shape of LED lamps subject to certain restrictions.

12, LED unit price is too high an imported 1W-3WLED will be about 3 US dollars, domestic also have more than 10 blocks (poor quality, no intellectual property rights) about a 6 LED around the lamps sold to consumers , Almost more than 1,000 yuan RMB, do you want to buy color TV or buy lamps.