How do I determine my ballast type?

Ok so I know this is kinda a noob question but I can't figure out what my ballast type is exactly and I know this is a crucial element to determining the best bulbs to get for my MH. The retrokit is a Hamilton 250w Mogul Base, there is a single bulb and a dual bulb set up (3 bulbs, 2 ballasts). I purchased this kit from saltycritter.com not sure how to post a link (Im comp illiterate) but its pretty easy to find.
http://www.saltycritter.com/lighting/metal-halide-ballast-hamilton.htm
(figured it out)

 

look at your ballast for any writing, type that writing in google. TADA!


if there is no writing post a picture of it and hope you get lucky.

 

So what bulbs would work best here?

 

What ballast did you determine you have?

 

The one I posted a link to

 

Hello. I had the same problem not being sure what my ballast was because I bought the tank used and could not find any writing on it. (it had 2 175W MH bulbs when I bought it). I called Marine Depot, who I order from online all the time Aquarium Pet Fish Supplies, Tank Accessories, Products & Equipment. they told me which bulbs will work with basically any ballast and were VERY helpful. Still don't know what my ballast is, but I have MH bulbs that my coral (soft and LPS) love.