A t8 bulb does best inside the enclosure. You can attach it inside or you can get a t5 fixture and bulb that will sit on top of the screen 

The Reptisun T8 10.0 bulb does not come with a hood you will need to order the hood separately.

The Reptisun 10.0 lamp is only the bulb you will need to purchase the hood separately.

as long as it's a T8 fixture of the proper length, it should work fine. only thing you might want to add would be a reflector, as standard overhead fixtures don't always come with them. and double check the wattage on the fixture to be sure it matches or exceeds the bulb, for safety.

I use this light bulb with a hooded fixture that goes from one length of my terrarium to another. There are a number of long hooded fixtures that will take the above 24" 10.0 light, ....the size of the bulb obviously depends on the size of the terrarium. This is a light primarily for desert animals/reptiles conforming to their needs for heat and UVB rays. Most hooded fixtures have outlets for other bulbs as well, i.e. heat/basking lights. That's why I prefer a long hood to the dome shaped lights...the light above is almost the length of the terrarium, which allows the animal to receive UVB throughout the enclosure and also offers heat and night light as well.

Thank you for your question. You can use the 24" Zoo Med ReptiSun T5 HO High Output Terrarium Hood with the 24" Zoo Med ReptiSun 10.0 UVB Bulb. We have placed a link below for this fixture. http://www.drsfostersmith.com/product/prod_display.cfm?pcatid=25698

Thank you for your question. The manufacturer lists this bulb as a 32 Watt, T-8, 48."