I've been a SCUBA diver for more than 40 years and had a lot of big LED lights that used multiple C-size batteries. My last incan must have weighed two or three pounds. Today I picked up a COAST Lumiled LED Lenser at Big Lots for ten bucks! It runs on 4 X AAA and has a bright yellow plastic body, polycarbonate lens, and stainless steel head. The tint is nice, but the beam has a visible square from the emitter. It advertises 32 lumens and says it has "more than 60 hours of battery life." Are there any brighter/more efficient P4, Q5 or R2 based waterproof lights for SCUBA?