St0ney

They are not efficient enough and do not have the right kind of wavelength. I started growing with a MV and since switching to a HPS I have had WAY better results. Go check out the hardware stores for security lighting. They should have cheap 70 - 150 watt HPS for under $75. I'm using a 150 w HPS right now and it produces much bigger buds the 175w MV I had.

See the MV is the oldest form of HID lighting. Since it then technology has given us more efficient lighting. The MH and HPS both produce more light watt for watt then the MV. The HPS will produce more lumens per watt used the either of them. But, The newest Fluorex compact florescent lighting has now surpassed even the HPS in efficiency. You can got those for under $40. Hope I helped.

St0ney
Stayin Rky Mtn High

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"A man's ethical behavior should be based effectually on sympathy, education, and social ties; no religious basis is necessary. Man would indeed be in a poor way if he had to be restrained by fear of punishment and hope of reward after death." -- Albert Einstein