Here you go:
http://boards.cannabis.com/indoor-li...uch-light.html

Metal Halide is normally used for vegetative growth as it is higher on the spectrum, giving it that bright/day/white light.

High Pressure Sodium is normally used for flower as it is lower on the spectrum, giving it that soft/orange light.

CFL's can be found in both spectrums and can be used for vegging and flowering, depending on the bulb.

How much light you can provide the plant will depend on how many plants... how big is the space... what are your temperatures... how well do you exhaust the hot air, etc?

Check these out too:
http://boards.cannabis.com/indoor-li...-lighting.html
http://boards.cannabis.com/basic-gro...-dankness.html

Any questions? :rasta: