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.

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 peaks and will …

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 you are …

Oct 21, 2014 · A 250 watt hps should be adequate for small seedlings in a 80x80cm area, as long as you have lots of reflectors keeping the light in. Once your seedlings get bigger, they will start to …

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 middle …

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 generated by the …

Jan 5, 2007 · MH has hazards, HPS is better, but it has a very high operation temperature, as is the MH as well. also your power costs are VERY high. You can get a PFC easily buy buying a motor run …

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 example, a 6400k cfl …

Feb 24, 2010 · Yes, you can have them almost touching the foliage - but it won't be very effective with any reasonably sized plants. HID - High intensity discharge are a better option - preferably Metal …

Sep 13, 2012 · Since I'll be filling up a greenhouse full of plants and only have a paraffin lamp that only has enough power to raise the temperature by about 5F would metal halide lights put out a …