Will a Reptisun 10.0 fit this fixture?

Agh, I hate posting multiple times a day, but I gotta.

The enclosure I bought at Repticon a few weeks back already has a light fixture in it, it came with a bulb but it was an aquarium light. So I'm asking this because I have NO idea what I'm doing when it comes to lighting and fixtures. This is the fixture that it came with


http://www.lightsofamerica.com/Products/7020.aspx

Is there a Reptisun 10.0 that would fit it?
All I can find is a Reptisun 10.0 18 watt. The fixture is 24" long. does the wattage represent the circumference of the bulb?

I've been using the zilla t5 bulb, but I read that it can cause health problems. :tears: :confusd:

Im just trying to use this fixture since its already installed.

I just need some help

This is the closest thing I can find. The bulb that came with it says 20 watts on it. So does this one, so would this fit it?

http://www.lotsofpets.com/zmed-repsun20w.html

DISREGARD THIS THREAD COMPLETELY. I just found out the bulb is a basic T 12 :banana: