I wanted to check the power consumption of my LED bike lights, so i connected my multi-meter up and switched the light on.
Initially the current was 1.2A, but over the next 15 mins or so the reading dropped to about 0.7A, there was no noticeable change in light output. At first i thought this was some sort of heating effect reducing the current.
But if i switch the light off and on again quickly the current would return to 1.2A and again drop off over 15 mins or so.
Can anyone explain what is going on? Shouldn't the current usage be more or less constant?
The bike lights are the generic "magicshine" LED type lights connected to 18650 batteries if that matters.