I have got one of those ring led super bright inspection lamps.
The lamp inside my van dont work, the inspection light was ideal i thought i will stick it on the roof with the magnet bit so i can see what i am doing filling up the tank for tommorows work.
`plop'
It only drops inside the tank dont it, sitting at the bottom illuminating the tank like a great big red boiled sweet.
took me 10 mins to get it out using wire coat hangers. durrrrrrf
its still working, even though its saturated with water. lol