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Specialist Forums > Underwater Photography Forum > What is 'burn time?'
posted : November 1, 2005 Post subject: What is 'burn time?'
Hi, I've been looking at torches and there are various 'burn times' what does this mean? Thank you.

posted : November 8, 2005 Post subject: What is 'burn time?'
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posted : November 10, 2005 Post subject: What is 'burn time?'
in answer to your question,
the burntime is roughly the length of time that a torch will produce a usable level of light on a single full battery, ie between recharges.

eg a 50w 12v bulb on a 12v 4amp-hour battery =
(50/12 = 4amps (ish) per hour)
60 minite burntime

this is approx. usually it will be slightly less.

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