Short test of the output of the gravity light.
On the low setting, a joule thief can be tuned to get 15 minutes of dim light per foot of drop. The weight, seems as though it almost comes to a dead stop, from the resistance.
Max output is around 0.1 watts.
The leds I’m using are Nichia NSPW510HS-K1 5mm led, which get around 170 lumens/w.
@10 mA 2.6v = 6900 mcd
@20 mA 2.8v = 13800 mcd
@40 mA 2.9v = 26220 mcd