I'm with Lynn - 21W HID Salvo. And this is the best light I ever seen.
Mania
Mania
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WARNING WARING WARING OMS Lithium-ion could put your life at risk.
PROBLEM, you plan your dive accounting for half of the stated Burn time of 270 minutes, your light is 3 years old and 60 minutes into your dive your $1,000 lights fails. Or you buy a "NEW" battery from OMS not knowing they are selling old batteries. Your back up floods and your 3rd, well you just did not bring it. Have a nice dive.
I have been diving the GreenForce LED (Tristar Plus) for a couple years now and love it. In the water it is indistinguishable from a 10W HID. There have been no problems whatsoever with my light or the ones owned by a few of my dive buddies.
A big advantage of the GreenForce, though, is that it is modular. You can detach the LED light head and attach an HID if you wish, or attach the new and improved LED that will undoubtedly come out in the future, without having to scrap the entire light.