You can look here at the pictures. http://www.discount-hydro.com/lightbulbs.asp you will see the difference right away.

The multi-spectrum bulbs are very good. I guess I am just old school because with my MH to veg and HPS to flower I get the same as others in my circle who use multi-spectrum bulbs. The Idea of one bulb start to finish though may be the way to go for you and I do know they do work. For me I will stick to the same light cycle I have used for the last 20 years.

Peace
Zandor Reviewed by Zandor on . HPS Bulbs Does anyone know where I can buy HPS light bulbs? Are they at like walmart or Home Depot? Because I havn't found any labeled as such. Thanks. Rating: 5