5.0 or higher reptisun??

[Eric]

I have a 20 gallon virtical style tank that i am preparing for a new baby ig. I know its not very big but it will do for a little while. I have an 18 inch fluoresent fixture. Is better to have a 5.0 or 8.0 reptisun bulb. does it matter, and can there ever be too much?

[JennaAndIguanaGwen]

I wouldn't worry about giving him/her too much UVB, typical wild iguanas get more UVB than pet iguanas. My advice would just be to keep an eye on the temps because its hard to control temps in small enclosures.