Burn time of primary light

[Agent 47]

What's the formula for determining the required burn-time capacity of your primary light for a given dive? By DIR standards.

 

[Soggy]

It depends on the dive, but for a primary light in an environment where the light is life support equipment (cave, overhead, deep, dark, night) it would be rule of 1/3rds (1/3rd in, 1/3rd out, 1/3rd for reserve) PLUS at least two separate backup lights with non-rechargable batteries that each have double the required burn time for the dive.

 

[Jason B]

I want my burn time at least 1.5x my dive time which I believe follows what Soggy just posted.

 

[Agent 47]

That's exactly the info. I was looking for.

Thanks.

 

[Soggy]

I want my burn time at least 1.5x my dive time which I believe follows what Soggy just posted.

I think yours is a lot easier way of explaining it.

 

[MonkSeal]

That's exactly the info. I was looking for.

Thanks.

Just take in count that during the time battery burn-time will decrease, so if purchasing new one go little bit over 1.5 factor.