led

the spec sheet shows efficacy (umol/J). efficacy drops quite low with all the switches flipped based on spec sheet. unless it's showing a different price for my region, looks a little expsensive. think you can find something similar on alibaba - parts come from same samsung + ??? factory in china anyway, lol. easy to find lights that are decent: White diodes - LM301 (B or H) - 3000k, 80cri is a bit more efficient, but 90cri will look better for pictures if that is a concern, i think. not much lost, percent or 2? also want dome 660nm red diodes. anything above can be gravy, but also reduces efficacy a bit. Couldn't tell you what is definitely worth it or not. (e.g. UV, IR and any other wavelengths outside of PAR) The last thing you need to ensure for the spec sheet to be accurate is watts / # of diodes = ~.35-.4 watts per diode. This means they are not driven too hard, which means you don't get the advertised longevity nor efficacy. At this power, your tent circulating fans are enough to keep them cool. Heatsink doesn't have to be heavy-duty, but make sure it's not just a thin sheet of aluminum. to get an idea, the cheap bar/strip heatsinks on heatsinkUSA are rated upto 1.4a? they are as cheap as you'd want. make sure similar robustness or better. cannot go wrong... diodes, watts per diode... you'll want 30-35 watts per square feet with an efficacy around ~2.7-2.8umol/J and ambient CO2 with any fixture with these sorts of diodes et al above. If you shoot for ~40w per sq ft. you'll definitely dim a bit (~430W per m^2). Or, about 850umol/s per m^2 with ambient co2, and more with added co2. Good to overshoot a bit, so you can start a bit dimmed and increase over 7+ years to maintain same exact coverage/intensity (natural slow dimming of diodes, 80% after 50-60k hours). Definitely get the bar/strip style. You'll get the most even coverage. One thing to consider is that you want the width to nearly span your tent. light doesn't project out as much at ends of the strips as it does in other direction. that floramax could cover a 4'x5' well but not a 5'x5' as well. (assuming it is almost 4 feet wide).