I haven't had these for long enough to judge the yield but I just installed 2 of them in my tent to add to my current setup.
I'm pretty impressed with the quality and the convenience of having the timer built into the lights. I have some power issues (not enough) but adding these lights doesn't seem to be heating up my breaker so without a kill a watt, that's the best indication I have that they aren't using much power and being efficient about what they do use.
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