>>2662775Research PPF and PPFD, the only useful metrics for hydroponic lighting. You need to know the umol efficiency rate of your light and the (real) wattage. Lumens are inconsistent and not the unit of light that plants respond to anyway.
>umol rate x wattage = PPF>PPF / m^2 = PPFDDUDE WEED maxes out at around 1000 PPFD, with autoflowers stopping around 800. Dont bother flowering under 5-600.
LED > All. HPS is cheap but hot and innefficient. CMH is goated for Quality etc, but UV precautions apply with those too. A bargain bin LED should be above 2.0 umol efficiency always, the high quality ones get close to 3.0.
