![]() While manufacturers list L70 lifetimes (time to 70% of original output) of crazy numbers like 50,000 hours or what not, this number is usually at a low current and Tjunc. This means you want your results to be at the lowest B numbers possible (if they quote them at all). So for example a B50 number would be the amount of time until 50% failed or B10 would be the amount of time until 10% failed. It LEDs it is more common to use the value L70, which is analogous to the half-life except the reference point is 70% of output (you may also see L50 used, which is the same as half-life).Īnother aspect of lifetime which is commonly quoted is the physical lifetime. ![]() ![]() The point at which the intensity is 1/2 of its original value is known as the half-life. As most of you know, this means that the intensity of emission decreases over time in an exponential fashion. Phosphors as with most other emissive materials have a half-life. In some rare ones, special quantum dots are used as the phosphor. Other makers may use broader band phosphors to achieve a similar effect (this is more common with blue LEDs). Often times a combination of phosphors (such as greens or reds or oranges) are used in order to get a warmer or more level output (more common with UV LEDs). ![]() Your white LEDs usually uses some sort of yellow phosphor over Blue-UV LED to produce the white light. OK, I have a bit of time to flesh this post out now.įirst off, I am VERY surprised this is just now being covered. Originally Posted by PedroDaGr8 /forum/post/20417582 ![]()
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