Hi -

I have heard a lot about these bulbs (I think this is the Ceramic metal halide that I have heard good things about)...but I cannot discern from the information whether these will run on a standard 400W Metal Halide ballast (I believe I have a SunSystem ballast that is a few years old).

Can anyone tell me if it will, or if it requires an HPS ballast to operate?

Thanks!

Here is a link that might be useful: MasterColor