I already tried to calculate the right resistance for a 5 w Led, but that’s beyond me. Especially when I want to recharge the batteries.

I looked into Torch replacement bulbs. They seem to be simple enough…

Thanks! That might be good. I wonder if the Diode is bright enough, but I guess I have to test that.

True. Lots of them are watertight metal casing though. Thats why i was kinda hesitant to pick one.