This is the 10.0 compact flourescent that screws into a regular clamp lamp? If so, their track record with me:
1. Bought my first one last January, it lasted a little over a month before it stopped working.
2. Got a replacement, which lasted about 6 months before it stopped working.
3. Called Zoo-med and was told to send the bulb back for a replacement.
(Have yet to do this, but will).
4. Ordered 3 more from big als in early November. I came home last Fri. to find one of them hanging by the wires over the basking area! (the bulb had come loose from the ballast/base). It scared the crap out of me, since the bulb was still lit--if somehow the weight had caused it to fall and go into the water my turts would have been fried.
5. Called Zoo-Med yesterday.

The person who deals with problems was away, so I vented at the receptionist. Two bulbs are waiting to be packed and sent back for replacements. Can't wait to see how long the other two are going to last.
So, be prepared to get a new one fairly soon. I don't know of anyone who has had them last a year (the box says to replace yearly). Or, you could be extraordinarily lucky with yours.
About the bulb--it's supposed to emit sufficient UVB rays up to 20 inches. The initial UVB output is supposed to be high, but the burn rate (how fast the bulb loses UVB strength) is also supposed to be high. It should be used in a reflector dome to maximize UVB output.
I've got a 10.0 tube I'm going to be trying for the first time. Hopefully, the longevity will be better.
One of the 10.0 compact flourescents I'm currently using is positioned over the basking area next to the heat lamp; the other is on the opposite side of the tank from the heat lamp (smaller tank) over the basking area.
"You become responsible, forever, for what you have tamed." -Antoine de Saint Exupery-