Yes, mostly bright --- BUT Volts x Amps = Watts That's the math, dividing 300 watts by 12 volts gives you 150 amps. That's enough for welding. I hooked them up to a 12 volt battery and they only draw 4.25 amps. That's 51 watts! not 300 watts Since I'm using a battery and solar panel to light up a remote warehouse I'm glad they only draw 4.25 amps. I need the batteries to last a few hours and I'm putting in a lot more too. The seller may paraphrase to say that 300 watts is equivalent lumens in incandescent bulbs.
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