Will do. I think am going to wait until the T8 10.0 bulb we have hits the 6-month mark (since we already spent the money on it) to upgrade to the T5 10.0. My dragon has an extremely healthy appetite and basks all day, so I think she will be okay until then.
Depends on the size of the cage. Aim for about 1/2 coverage, this allows for adequate gradient. A 2ft lamp will be good for up to a 4-5' long cage, 5'+ I would look at a 36" and some additional ambient lights. (Or a multi socket fixture).