Been running the Broview S5 H4, copper braid heatsink, no fan, bulbs in several motorcycles including two XS650's with stock headlight cans many thousands of miles now, zero issues. Unfortunately they are no longer available so will have find a fan type bulb that fits in the shell. Basically watts equal heat so the cognito moto unit puts out slightly less heat than the stock bulb and it does have a fan. A few have bored a big hole in the back of the can to make more room and increase air flow, I don't think that's needed for heat management.... Headlight is right up front in the air stream the lens, ring and can all transfer heat out to the passing air.