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I am curious, when you cut power to the LED array, does the array
continue to glow at all? If so, what color?
It won't be a long-acting phosphor like they use in commercial
glow-in-the-dark materials these days, but it may have a residual
glow.
--
When the LED lights are shut off , they go dark instantly. If they have
been on
recently, and have not had time to cool down , they come to full
brightness
instantly. So it's definitely heat related. There is nothing available
that
explains this effect that I can find. But it has to be a temperature
effect
with the phosphor material. LEDs switch at high speed , they are used in
fiber optic communication. ( Though LASERS are better.)
Bob Zannelli