Plant lighting

longer is better...

I'm sure the tube will be fine, but you'd be much better off with a longer tube (and fixture). 18" tubes are pretty puny.

48" tubes usually cost the same or a little bit more than a short one, and they give you a lot more light for the watts used. Its OK if they hang over the ends of the cage. Put some plants outside the cage too.
 
At Lowes, I got the brand - UTILITECH 48" T8 Fixture in black
I also got a package of 2 - 48" T8 6500k colored flourescent bulbs

Total = under $20

Then I put 1 - 48" Reptisun uvb 5.0 bulb & 1 - 6500k bulb in the UTILITECH fixture. The plants grow great and the enclosures are nice and bright.
 
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