Single LED white light aging board detected in the data, and the LED white light detected when assembled into a lamp aging data, is certainly a bit out of. The size of this difference depends on the LED electrical work and lighting design parameters, as well as environmental lighting use.
Choose what kind of LED lamp beads
This is very important, LED lamp beads quality can be said is a very important factor. Give some examples, the same with Epistar 14mil white chip segment represented do with ordinary epoxy primer with white glue and glue the package out of the LED lamp beads package, single lights at 30 degrees in the environment, a Thousands of hours later, the attenuation data for the light fades to 70%; if the Class D low attenuation glue package, in the same aging environment, thousands of small-time decline of 45%; if the class C low attenuation glue package, in the same aging environment thousands of small-time decline of 12%; if the class B low attenuation glue package, in the same aging environment, thousands of small-time decline of 3%; if A class of low attenuation glue, in the same aging environment, thousands of small-time -6% decline.
In general, the thermal conductivity ordinary epoxy resin is very small, so when the LED chip work when lit, LED chip to emit heat, and limited common epoxy heat capacity, so when you are from the outside of the LED light source measuring the temperature of the LED stents have time to 45 degrees, the temperature of the chip LED white lights in the center is likely to exceed 80 degrees. LED nodes temperature is actually 80 degrees, then, when the LED chips working in the thermostat temperatures, is very languishing, which accelerate the aging of the LED light source.
LED light source operating ambient temperature
According to the data when a single LED light source aging perspective, LED light is lit if there is only one job at the same time, it is where the ambient temperature is 30 degrees, then the holder temperature single LED light source at work does not exceed 45 degrees . This time, the Fengyun LED life will be very satisfactory. If there are 100 LED light source lit simultaneously work, the space between them is only 11.4mm case, then the temperature of the surrounding stent LED light source lamp stack may not exceed 45 degrees, but those LED lights in the middle of the heap light source may reach a high temperature of 65 degrees. This time, the LED light source is a test. Well, those gathered in the middle of the LED light source, the light fades will be faster in theory, but the lamp heap surrounding LED light source, the light will slowly decline. However, if the LED lamp beads separated by more than 25mm, then they diverge from each other would not be so heat build-up, this time, the temperature of each LED lamp holder should be less than 50 degrees, it is more conducive to the normal operation of the LED.
If the LED work environment is relatively cold places, the average temperature throughout the year may be only about 15 degrees or less, and that the LED, the life even longer. Alternatively, when the LED work, next to a small fan blowing, help it to disperse the heat, this way of life of the LED is also quite helpful. Anyway, we should know, LED is afraid of the heat, the higher the temperature, the shorter the life of the LED, the lower the temperature, the longer LED life. LED ideal operating temperature is between -5 course to zero. But this is basically impossible.
LED lamp work beads design electrical parameters
According to the results, LED white light at lower drive current, the heat emitted by the smaller, of course, the smaller the brightness. According to the survey, design LED solar lighting circuit, LED drive current is generally only 5-10mA; the number of lamp beads with large lamps used products, such as to reach 500 or more, or more, the drive current is generally only 10-15mA , and the general popularity of LED lighting applications drive current, only 15-18mA, very few people to the current design to 20mA or more. The results also show that the drive current of 14mA, and add a lid unventilated inside air temperature reaches 71 degrees in the environment at low decay products, thousands of small-time decline to zero, 2000 a small decline of 3% , which indicates that such a low failure LED white light used in such an environment has reached its maximum, and then big is it the kind of damage.
Because aging aging plate with no cooling function, so the heat generated LED work is basically impossible to go outside of conduction. We prove it experimentally. Aging board inside the air temperature has reached a temperature of 101 degrees, the surface temperature of the cover plate is simply aging 53 degrees, a difference of several tens of degrees. This indicates that the design of the plastic lid has essentially no thermal cooling. But the general lighting designs, are taken into account thermal cooling function. So, in conclusion, the design of electrical parameters of the LED lamp according to the actual situation, if a good thermal cooling Lights, LED drive current to increase the white light that is okay, because the work produced LED lamp beads instant heat can be exported to the outside, there is no damage to the LED, the LED is the best care of. Conversely, if the lamp thermal cooling function so-so, the best circuit designed to be smaller, put less calories out.