Boyznus: I believe the point of conversion bulbs is that they can be used in both ballasts. Someone correct me if I'm wrong.

Karmaxul: Is that discussion regarding the use of regular MH bulbs in HPS systems?

I'm specifically asking about the use of conversion bulbs.
smoknjoe Reviewed by smoknjoe on . MH and HPS conversions So, if I understand this correctly.... They make MH conversion bulbs that can be used with both MH and HPS ballasts. and They make HPS conversion bulbs that can be used with both MH and HPS ballasts. Is this right? So, if I wanted to use MH during veg and HPS during flowering, I could buy a MH system and an HPS conversion bulb, or I could buy an HPS system and a MH conversion bulb, right? Rating: 5