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Now do you know how I would calculate the AC power requirements?
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Your AC should be pretty much Watts in = Watts out/efficiency
Drivers vary efficiency depending on how well they're used(they like to be run near max all the time). usually >70% though. so 48LED's, driven at 3v per LED, at 750mA(3/4 load) would be about 86.4W at 80%, so 0.72A at 120V. Not bad at all...