Feb 16, 2006 · As far as I know, HPS (high pressure sodium) is the most efficient lighting system. With grasses, etiolation doesn't seem to be as much of a problem as it would with e.g. tomatoes.

Dec 20, 2006 · Unlike HPS, you can bring the light practically right on top of the leaves without experiencing leaf burn. Its amazing how if its done right, you can have cuttings rooting in the …

Jan 6, 2007 · A 600W HPS - the proverbial design "sweet spot" - coupled with a digital ballast - less than $250 USD, with a power factor of 0.99 or so - would be far less efficient due to heat …

Dec 2, 2009 · One option may be to get a 1000watt HPS, or metal halide plant light, which should be enough to keep the plants happy, but cost a lot. Another option is to keep the plants …

Dec 28, 2011 · From seeing commercial growers, I usually see greenhouses have metal halides, hps, or T5 flourescent bulb setups so having the right kind of light is very important. For …

Jan 22, 2007 · The MH/HPS bulbs also can and do explode sometimes during operation sending very hot glass not to mention the vapourized mercuric oxide (s) into the surrounding air. Yes, if …

Sep 4, 2015 · The Excelvan PG01 LED grow light will emit light in the red and blue wavelengths at 620-630nm and 460 to 470nm, these wavelengths correspond to chlorophyll's absorption …

Feb 24, 2007 · The idea is a bit tempting: 150W HPS for less than $40, NPF ballast and bulb included, or even a 400W HPS for a little over $100, with a quad-tap CWA ballast and bulb. …

Sep 18, 2013 · Hi everyone, I'm thinking of trying to grow some ground cover plants indoors over the winter to give them a head start before planting them in the spring. The 2 species I …

Oct 26, 2006 · Seedlings definitely need much more light than a light-deficient adjusted adult plant or juvenile plant. I think if you use a combo of both MH and HPS lamps you would be fairly …