Quote Originally Posted by lemonboy
On that site it says "We do not offer anything bright enough for general household lighting. LED bulbs are used for accent and other low light applications." They can't be appropriate for growing.
cannabis receptors reach saturation @ 1500-1800 micro-moles and will disregard any light outside the wavelength it is looking for at that particular time within it's growth cycle.

therefore the importance of quality and quantity of PAR light at the receptors cannot be understated. One of the things that I found LED's had difficulty achieving was, as nature would provide, photomorphogenesis wherin the spectrums, especially IR levels, would not be so narrow that the full yield inhibited by lack of enough energy in red and far red levels without having to create an LED lamp/driver combination that would rival HPS in wattage while being 4 x the price and needing 2 or 3 of them to cover the same area.

any grower having compared yields between the most advanced LED and the simple HPS will attest to the compromise in yields. So while we all would like to find the holy grail of energy efficiency, lamp life, PAR spectrums there really is a much simpler way to go about it.