I’ve owned this dive light for several years. It has been totally reliable. As with all things the bulb finally gave out. Underwater Kinetics came to the rescue and shipped a new replacement assembly with an LED as the light source. Pulled out the dead one, installed the new and the light is at least 3 to 4 times brighter!
WONDERFUL! Can’t recommend them highly enough.

This is a must do update/upgrade to older SL4 Xenon lamps.