Tube UVB Wattage and Fixture

[Boris_Russian_Tortoise]

What wattage should a strip UVB bulb for an adult Russian? Also can I buy a fixture from like Walmart or another store for cheaper or will that not work? Because the ones sold especially for it seem unreasonably expensive

 

[ZEROPILOT]

As far as I'm aware, these can't be beaten.
The price is around $50
The quality is quite good
This comete tube and fixture is a 24" T5 HO can be purchased at LLL REPTILES or BIG AL'S PETS