Before you buy anything I highly recommend reading everything on this webpage for it has what you need to know about lights:

http://www.overgrow.com/growfaq/t101

And if you really want to become a cannabis genius I suggest you devour the entire FAQ located at:

http://www.overgrow.com/growfaq/


From what I understand HPS is the WAY to go as far as flowering is concerned. You also might consider an enhanced spectrum HPS bulb. They try to take everything that a HPS bulb has (spectrum wise) and add what the MH has (spectrum wise (bluish)). I have only heard good things about these bulbs..

Q: What is the difference between Standard and Enhanced Performance HPS Lamps?
A: Standard High Pressure Sodium lamps emit an orange/yellow color that is similar to the sun's spectrum in the mid day. This type of light promotes flower growth. However, as mentioned above, the lack of blue spectrum light in Standard HPS bulbs can sometimes make a plant stretch during the vegetative growth stage. Enhanced Performance HPS lamps have a wider blue spectrum, which makes a significant difference in plant growth.

I hope this answers your questions. Again browse the growfaq @ overgrow.com before asking any more questions. You would be surprised by how many people have the same questions as you!

Happy Growin,
ybg