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Idea based off "The 555 FireFly by DJJules"
Essentally there are already LEDs that can blink or flicker without an external circuitry, via a small microchip embedded within the LED's epoxy case.
These LED blink circuitry are very efficient. If combined with the right resistor and and capacitor,
it can blink for years.
This is often handy for things like blinking indicators on first aid kits. However what if the battery runs out, or you want the battery to last even longer?
Then try replacing the epoxy with glow in the dark paint! Also modify the embedded microchip to sense light level. If the glow pigment is below a certain amount of light, then trigger the next pulse. This means that the LED would not be blinking when there is enough light, only blinking if the room is dark, or the glow pigment is too low.
Thus making it a great way to power markers even longer! (especially if solar powered to a super capacitor)
[MechE, Feb 04 2014]
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||Not a bad idea. I can't help feeling, though, that
there's only so much light you can get out of a
battery, and what you gain on the roundabouts you
lose on the horses.
||And incidentally, isn't it just "luminescence"?
Photoluminescence would be a bit like sonosound.
||It's light resulting from light, the same way electro-
or chemo-luminescence are light resulting from
electricity or chemical action respectively. See link
for the wikipedia entry.
||Ah - in that case, carry on.
||[ ] I sorta get it... the actual neat bit is the photocell usage. Of course by the same token it'd be even more efficient if the photocell simply didn't have any light reflect into it from the LED.