Yeah, I use a aqueon I think, it's for fish tanks I think, it's what the breeder recommended. I have one of the exo terra light cycle units too, but I don't really like it much. I've just heard other people say you could use anything. I would believe the other two posters though, they both have light meters (I think jarich said they did).
You can always try hanging it from the screen as well, as long as it's one of those strong metal screens, I've done that before too. I don't know if you saw my picture earlier showing how I did it for Bam Bam's light.
So he must be out and about now since you have decided to get the reptisun? Is it warm enough yet outside there? On Easter I took both of mine out, it was 70 here and beautiful out. I have a pop up dog play pen thing that I got for 5 bucks at goodwill brand new that I put them in. Pebbles loved it, Bam Bam was skittish and scared I think. I'm sure it was the first time ever for them. If you have a way to let him have some real Sun for 15 to 30mins (I wouldn't do more than 30), like a tall Rubbermaid tote or like it so he can't escape. That way he can get some good uvb if you just wanted to leave the mvb off in his tank until the reptisun comes.
Btw when it was 70 here I was reading basking spots of 100-115 or more depending on material so bring your temp gun out, I had to put a old t-shirt in the bottom since the bottom is black it was reading like 120. And you will have to sit there with him and watch him, you don't want him escaping (or getting scared to death or prey for something else).
Oh, btw JARICH I'm sorry, I must have read your post wrong or just didn't understand that you meant the Yahoo group was the one that had the bulb designers posting there as well. The uv guide site is great and thanks for posting the link it's been a while since I've read the site, hopefully she gets the updates done soon.