Dear Socrates,
You can figure out the total draw yourself. Add up the wattage of each bulb (remember to double it for a pair of bulbs). Divide the total wattage by 12 (nominal voltage) and you will end up with a number roughly representing the additional current draw (in Amps or Amperes) on your battery. Remember that this is in addition to any other draw on your battery at the time (wiper motor, fan, CD, etc.)
e.g.
For a pair of 75w lights and a pair of 100w lights,
(75w x 2) + (100w x 2) = 350 watts total
350w/12v = 29.2A
So your battery is “seeing” an additional draw of about 30 Amps, every time you flip those light switches on.
I hope this helps
t~
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