Some say it does and any extra co2 is better then none. I used dry Ice for about a year before I could afford tanks, regulators and controllers to monitor the PPM level.

Peace
Zandor Reviewed by Zandor on . HPS VS. MH Hello, thought i would start a new thread with a question? Is (MH) absolutely necessary for flowering? :rolleyes: I read that HPS will do the same as (MH) And :eek: if i purchased a MH bulb at the depot and put it in the hps ballast will it work? I don't want to buy it if it doesn't work, or will i have to buy the ballast "just" for MH. Thanks for any advice from anyone. :o Rating: 5