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       I use a twelve volt light with a 50 watt, 3400 kelvin
color temp 1300 lumens bulb. It lasts about forty hours and 
burns for 150 minutes in the pack. The batteries are rated
at a twenty hour rate, so don't give tht clean calculation.
I have a twenty amp hour (at a one hour rate) light that
will burn a 100 watt bulb for 2 1/2 hours, and a 50 w for more
than five hours. For the best looking light use the higher kelvin
color temp bulbs with the Gavin head #3 relfector through a
test tube (American Underwater or Gavin). Avoid the Oshram bulbs
and the enclosed light heads like MR16 and others - they kill the 
light. Also avoid the fly by night makers and the shapes that
obviously won't take pressure. Also avoid the wide beam angles.
  - George

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