My thoughts and opinions on flooring since i see others commenting on it
1. sand no, you don't want them eating it causing digestive issues.
2. No carpet. the poop will cause bacteria in it even after cleaned and his nails can get stuck in it.
3. Other options.
Floor Tiles (Cost Less than $1 a tile) From a home improvement store get some rough floor tiles. these will also help sand down and keep your beardies nails down
Newspaper, not as pretty as the grass, but you can throw it away keeping bacteria from your enclosure.
MY Favorite Option I have a Zen Habitat, so I have also one of their floor mats. It is a black leather Looking material, Easy to spot clean with a old tooth brush with out taking it completely out of the enclosure.
As for your lights. Those dubble Domb ones is not enough. I suggest getting one of the long bulbs so your guy can have uvb in more than that one spot and maybe a LED on the side of the tank opposite of your basking area so on their cool side of the tank they can still have light.