The cylinder and housing for the reflector are the same, I think, but the ballast is missing off the back, which makes the total size of what's sitting on the back of your hand significantly smaller.
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TSandM:2.5 hours is precisely accurate -- my light quit 40 minutes into the third dive. It was my education in the fact that these lights don't dim and fail, they just . . . fail. But okay, now I know I need to bring the second battery on three tank days.
Spoon:hey peeps remember not to let your lights fizzle out. this deep dischare is a big no no for your batteries.
Vie:So what would be the advantage of choosing the 21W 14.4 Volt Remote Head instead of the 21W 9A NiMH? The "remote head"/smaller light head? The canister size for both lights are the same, the 21W "14.4" has less burn time and is a hundred bucks more expensive...
Ben_ca:Can someone post pictures of the new remote head side by side with an old (non remote) and an 18W H