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P7 900 led lights Answered

How many of theses led lights can I run off of a car battery for 12 hours?
http://www.seoulsemicon.com/en/product/prd/zpowerLEDp7.asp

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Tool Using Animal

10 years ago

roughly 9 I'd say. 3.6 Volt means you should run three in series to keep voltage dropping to a minimum. and with a current draw of 2.8 amps, three strings will draw 8.4 amps, a typical large car batter is 100 amp hours so you'd get 11.9 hours. However repeated deep cycling a car battery will kill it quickly.

Additionally the max forward voltage is 4.2 volts and the voltage of a car battery is 12.6 volts, with three in series you might not need to drop the voltage at all.