02-22-2007, 09:37 PM
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Metal halide, while giving off massive lumens(light intensity), generates alot of heat. There are better choices to be made. The relatively new T-5 flourescent bulbs are very economical(low wattage) and have a relatively high lumen rating. Most fixtures I am using that are T-5s, Have dual bulbs, thus doubling the lumen rating. A full spectrum light (ex. gro-lux, sunlight, ect) is the best choice for spectral light. Try to stay away from cool white(the blue end of the spectrum) and warm white(the red end of the spectrum) as the light band in these are too narrow and do not provide good quality light in the middle or at the opposite ends of the spectral band.