Quote Originally Posted by turtle420
I don't get it...

'Conversion' bulb? What's that?

You hooked-up a MH to a 400W HPS?

WHAT????

What did you do exactly? Did you hook-up a MH or a HPS?

What's the bulb? MH? or HPS?
What's the ballast? MH? or HPS?

I'm intrigued with this 'conversion bulb'... maybe you can do that... but my ballast has like 443 warnings that I shouldn't connect a MH bulb to the HPS side, and the other way around...

A conversion bulb is a HID bulb that allows you to run a HPS bulb on a MH system or a MH bulb on a HPS system. Here take a look at them here. http://www.bghydro.com/BGH/items.asp...atus=0&Tp=&Bc=