Romisen RC-T5 is good to use as divelamp. I have dived 5 to 10 meters 10 times, 10-20 meters twice, and 20 to 25 meters twice with my RC-T5. What I have done is to replace the glass to a 2mm polycarbonat glass and the grease in all orings and the tailcap and tighten the tailcap. First, I had the problem that the light was shut off at about 8 feet of water pressure on the tailcap. But I short circuit the power switch with a steel wire at the bottom. Now it operates as a twisty.
All the other divers say, Wow-what torch!
All the other divers say, Wow-what torch!