Are can lights still necessary for non-cave tech diving?

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Ya, something like that. Maybe I was mistaken and it doesn't fit the dive standard one we all use.
 
You dont carry your weight belt or integrated weight just so you can ditch it, you carry it to offset the bouyancy you have in your gear...

The canister should also be part of the ballast, not something to carry on top of a properly weighted rig. So it is helping to offset the buoyancy of other gears. It is just a bit bigger than a 2lb lead but it serve another purpose.

---------- Post added June 5th, 2014 at 11:22 AM ----------

I have yet to come across a canistered LED that is as bright or punchy as HID, not to mention a handheld LED. If one day, handheld LED is that good, I will seriously consider switching to cordless LED
 
You need a light if it gets dark. If you are lucky enough to have daylight at 100m/300ft then no, you don't need a light. In that case you need to replace the light signs with hand signs.

I do sump diving. That means 2000m of cave with 100m of diving. I would call this technical diving because of all the challenges caused my mud and underwater crawls. I do not however need can lights (the cord would get in the way). Instead I have helmet mounter lights suitable for dry caves.
 
https://www.shearwater.com/products/swift/
http://cavediveflorida.com/Rum_House.htm

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