Question on Uvb size for diy enclosure

I'm building a viv for our soon to be new beardie and am wondering what the best length for a reptisun would be for a 4x2x2 melamine enclosure.

I was planning on purchasing the reptisun 10.0 t5 HO with the hood. Also wondering if anyone has attached the reptisun hood on the ceiling of their day enclosure. How hot it may get etc. Closest pet store to us doesn't have any hoods to speak of so can't take a look see for myself.

I had put in an order for a 36" hood, but put it on hold when some one on another forum mentioned having a UVB free space in the enclosure and about space with decorations. So I'm trying to get as much info from as many sources as possible.

I have a little bit of time so not a big rush, but my daughter keeps asking when her new baby is coming home. LOL

Thanks!
Dawn


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A 22inch reptisun HO T5 bulb will work well. Then you have a UVB free zone on either the left or right, depending on which side you mount it.