Quote Originally Posted by 9ski9
From Hydroponics.com:

Metal halide lights were created to provide a spectrum as close as possible to that of the natural sunlight. This coupled with their intensity and energy efficiency, makes them ideal for indoor gardening. The bulbs range
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five foot area will provide 40 watts per sq.ft., compared to 20 watts per square foot in a seven by seven foot growroom.
Hey 9ski9, would you mind giving me your input as to LED lights?
Here's the thread:::
http://boards.cannabis.com/showthread.php?t=34819

I would trully appreciate it!