Not so much as O3 as I do Ionizer (says it creates ozone). I use that for smell control, yes, and it also has a fan in it, so it is on the floor pushing air up. As for ballasts, I have none, as all mine are florescent bulbs....2 sets of which are the 'grow lite' types from walmart (looks kinda pinkish) and the other 2 are regular floro light tubes (24")...which reminds me, which side does the pinkish ones need to be on?