Yes.. you get an outlet box and bolt it to the inside ceiling of the cage using truss-head machine screws. Mount your fixture on the box. This helps with the heat issue on the plastic ceiling, because light fixtures get hot, and the polyethylene that Visions are made of has a low melting point. I've done this on 3 Visions with no problems.
If you are using low-wattage bulbs only, then you can cut a disk out of particle board, router out an area for the wiring, and mount the fixture onto that (mount the particle board disk to the ceiling of the cage.
The Visions that are 12" or 14" high do not really have the clearance to put a light in as described above (well.. you can, but it hangs down pretty low.) A better approach for these low cages are the low-wattage undercabinet halogen lights. You'll need to have a piece of particle board (like a 3.5" dia disk) to screw the fixture into. This works very well. I have 2 cages like that. Plus they do a great job of heating the cage. Use a dimmer though, as even a 20 watt halogen gets hot to the touch.
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Mark 