Hi Ron,
Adding a "day-light" bulb like a 6.5k, along with the UV bulb is a very good idea especially if you have plants.
Reptiles like Chams are truly "children of the sun", and you are taking an out-of doors TROPICAL animal and keeping them inside-- so light is CRITICAL.
Most reptiles here in North America tend to kept in under-lit cages.
The Europeans (Like my good friends at Arcadia!) discovered ages ago that full spectrum lighting
along with BOTH UV A and UV B are critical to their well being.
Now it is just catching on here... finally... with spectacular results.
The proof is in the pudding.

Just look at the number of posts you get here on Cham forums with people remarking how they Chams react so positively when they take them out-side for a few hours in natural sunlight!
They all remark how they color up, get more alert
and literally "come alive".
Well.
What does that tell us!???
It tells us that the 90% of the time they are inside-- they are being UNDER-LIT! 
And now with advancements in lighting technology, it is MUCH easier, and less costly than it used to be to get a closer duplication of natural full spectrum lighting inside.
The mixing of a UV a/b bulb and a full spectrum (5.6 - 6.5k-ish) sun-light like flo. tube is great for both animals and plants.
And it creates an environment that has a higher, more "out-door like" level of full spectrum light.
The prices have come down now too on the newer HO T5 lighting (the skinny higher out-put flo. tubes, like the Arcadia's) and this makes it now possible to do this now more economically than ever.
It actually now costs about the same!
And the bulbs go for at least a year and still maintain excellent UV levels.
Any way, welcome to the forum and best of luck with your Cham!
Light 'em up.
Cheers
Todd
Good advice Nick ~
and shucks -- you make me blush with your praise 

Thank you Nick!