DIR and the canister light: newbie questions

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Never seen it dim. Even on multiple dives were the light has been on for close to it's 4hr nominal limit.

The dris shorty does noticeably dim.
 
Never seen it dim. Even on multiple dives were the light has been on for close to it's 4hr nominal limit.

Maybe no noticeable dim, but even optimistically it's 800lm for 3.2 hours at max brightness. So there's no way it's maintaining full brightness for over 4 hours. Whereas my canister burns at 3500lm for 4.2 hours on max....and in the neighborhood of 30 hours with about 800 lumens.
 
Maybe so, but the light has worked perfectly fine for me for many years now. In all that time I've never ran out of battery juice nor have I ever received any complaints that my light is too dim. I have no plans for doing a 30hr dive nor even accumulating 30hrs of dive time without getting to a place with electricity and taking break that's long enough to fully charge my light -- I have charged this light using a cheap cigarette lighter inverter while I drive in between dive sites. For my needs, this is amply sufficient and I don't have to deal with chords.
 
It's the phone and it's swipe typing... H is in between the path that goes from c to o.
 
If you read the standards closely, a canister light is not technically required for a tech pass.



The primary light should consist of a rechargeable battery pack and be fitted with a Goodman-style light handle.


Where burn time requirements create the need for an external battery pack, it should reside in a canister mounted to the diver’s right hip.
 
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