Originally posted by lu wei yao
you can get the same bulb and buy the button battery from SLT(sim lim towers)
Ask Medium when he gets back, he has used it successfully in pitch dark on the balsa trainer plane from jet hobby.
I believe each bulb is only a few cents and the button lithium batts are $2 each. you need 6v to power one of those small leds to be bright enough!
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