Help?? modded Arc is on the fritzz

I have a modded Arc that runs 200ma or 400ma, recently the light output flickers and will go to low light level on its own.

Yeah, I have one of those too. Same problem. The trouble is the bezel pushes directly down on the LED via the optic to force the board down to complete ground. The tolerances are such that you may not be able to tighten your bezel down enough for a good ground. Try taking out the o-ring. I ended up doing some machine work on mine so that when the bezel is tightened down it contacts the outer circumference of the circuit board, more effectively forcing it against the light body for a better ground. Works much better than just pushing down on the led with the optic....

Dan C

Run a second grounding wire from the negative side of the LED to the edge of the circuit board..when the bezel is screwed down this added grounding wire will cure your flickering light.