For affecting the LED light failure causes
2012/12/12
LED lights as a new type of green lighting, energy-saving, environmental protection, long life, by our customers and pursue careers. LED light failure, an LED lights have to face the problem. The continuous light failure, a serious impact on the use of LED lights.

For now, the white LED market its light failure may be one of the most important issue to enter the civilian lighting. What causes the LED light failure? Generally speaking, there are two main factors for the LED light failure:

An LED product itself quality problems:

1, the bad, the LED chip physical the brightness decay faster.

Production defects, good LED chip cooling can not be exported from the PIN feet, LED chip temperature is too high attenuation exacerbate the chip.

Second, the conditions of use:

1, LED constant current drive, part of the LED voltage drive LED attenuation over.

2, the driving current is greater than the rated driving conditions.

In fact, for many reasons, the most critical heat problem cause the LED light fades, many manufacturers in the secondary products is not particularly pay attention to the problem of heat dissipation, but the long-term use of these secondary LED products, the degree of light failure than focus on heat LED products higher. LED chip thermal resistance, silver plastic, the cooling effect of the substrate, as well as colloid and gold wire with light fades.

Three factors that affect the quality of the LED lamps light fades

First, choose what kind of white LED lights.

This point is very important to the quality of the white light LED can be said that a very important factor. LED white lights, give me some examples, the same crystal the $ 14mil white light chip for bottom glue with white glue and packaging glue package out of the ordinary epoxy single lit environment of 30 degrees, thousand hours later, the attenuation data for 70% of light failure; low bad glue package with a Class D, under the same aging environment, thousands of small decline of 45%; If Class C low decline glue package, under the same aging conditions. Class A low decay glue one thousand small-time decline of 12%; Class B low decline glue package in the same environment of aging, thousands of small-time decline of -3%; same aging environment, thousands of small-time decline to -6%.

Second, LED lamp beads work environment temperature.

According to the data when the aging single LED white lights, LED white lights is only one light work, at the same time, it was the ambient temperature is 30 degrees, then the single LED white light bracket temperature will not work than 45 degrees. This time, the life of this LED is ideal.

If there are 100 white light LED is lit simultaneously work, the interval between them is only 11.4mm the case, then, the stent temperature of the vicinity of the LED white light lamps heap may not exceed 45 degrees, the but heap intermediate lamp of those LED white lights may reach a high temperature of 65 degrees. This time, is a test of the LED lamp beads. Well, those gathered in the middle of the white light LED, theoretically light failure will be a little faster, while the LED lights heap surrounding white lights, light failure will be a little slower.

Anyway, we should know that the LED is afraid of the heat, the higher the temperature, the shorter the LED life, the lower the temperature the longer LED life. LED ideal working temperature, of course, is between negative 5 to zero. This is essentially impossible.

So, we learned that the ideal operating parameters of the LED lamp beads, as much as possible in the design lighting, to strengthen the function of the thermal conductivity, heat. Anyway, the lower the temperature, the longer LED life.

Again, the LED lamp beads electrical parameters design.

According to the experimental results, the LED white light in the case of the lower drive current, the smaller the heat emitted, of course, the brightness smaller. According to the survey, LED solar lighting circuit design, the LED drive current is typically only 5-10mA; lighting the lamp beads with large number of products, such as the more than 500 or more, the drive current is generally only 10-15mA , and the general popularity of the LED drive current application lighting, just 15-18mA, rarely was the current design to 20mA.

The experimental results also show that the drive current of 14mA, and added the lid not ventilate the inside air temperature reaches 71 degrees environment, low decay products, one thousand small-time decline to zero in 2000 small-time decline of 3% This explains the low decline LED white lights in this environment has reached its maximum extent, another big its a damage.

Aging aging with the board no heat, so the heat generated by the LED work basically impossible conduction to the outside to go. The experiment proved this point. The aging board inside the air temperature has reached a high temperature of 101 degrees, the the aging panel lid surface temperature is only 53 degrees, a difference of several tens of degrees. This shows that the design of this plastic cover substantially does not have a thermally conductive heat dissipation function. Usually lighting design, are taken into account the function of the thermal cooling. Therefore, in conclusion, the design of the LED lamp beads working electrical parameters according to the actual situation, lighting thermal cooling function is good, white light LED drive current increase is that it does not matter, because the LED lamp beads produce The heat instantly able to export to the outside, no damage to the LED is the best care of the LED. Instead, lamps thermal heat dissipation so-so, the best circuit design smaller it less and put some heat out.
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