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In photography, twice the watt-seconds gives you one f-stop more light or 
twice the light, if this helps.

On Thu, 3 Aug 1995 Private_User@fo*.co* wrote:

> 
> Fellow, Tech. divers
> 
> +++++++++  From: Dave Drake   +++++++++++++++
> I am most impressed with an American Cave Light that I'm told has a 3 hour
burn
> time with a 50 W bulb.  ...etc.
> +++++++++  end snip  ++++++++++++++++++++++++
> 
> My question is why are so many technical divers interested in dive
> lights, WATTS.   WATTS have nothing to do with bightness.
> 
> If I remember my college physic's,   light brightnes is measured in
> Candle power  or Lumins.   If a diver what to know how bright a light
> is he and/or she needs to compare the Candle Power and/or Lumin rating.
> 
> Can someone help me out here???? 
> 
> Thanks in advance.
> 
> Gary McGee
> Detroit, MI   USA    (GMcGee1@TC*.pt*.fo*.co*)
> PADI Instr. # 4522
> IANDT ADV. Deep Air & Tech. EANx
> 
> 
> 
> --
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