Silly question.

How long are the shop light fixtures? I know they're all slightly different,
based on the brand. But, given that the bulbs are 48", the fixture must be
at least 49"? I'll be using the HD lights most likely. (I know, go buy one)

I want to build a canopy to match my stand, so I'm just wondering about the
logidstics/design. How much slack am I likely to need? Tank is 48.25 BTW.