Quote Originally Posted by Zandor
They make switchable ballast yes. They also make conversion bulbs so you can run a MH light in a HPS ballast. As well as the other way around. They have been on the market for years, it's nothing new.

Wow!

That's good news....I'm thinking of having two rooms...each with interchangable [MH to HPS] lights....So I won't have to move the plants and thus ...won't have to disturb the roots too much and can veg for longer [ebb/flow you see]

Anyway that is news to me..thanks:thumbsup: