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You started with 240 watt light bar on truck, said not 240 watts, ballast, ohms law yadda yadda. I got lost.
But led no matter how they’re powered do have an average wattage over some duration. Why exactly doesn’t a 240 watt light bar not draw 240 watts? Naive me I’d expect to need more than 240 to drive a 240 watt item, not get by with less. Unless it’s marketing and 240 is an upper bound? Why is it ok that your 240 watt bar only draws 96? Where’s the rest of those lumens that you paid for?
What bad thing would happen if someone started selling lights that used the watts that they claimed?
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