Not sure what you mean by light bench or wheels, but I built a bench and hung lights over it. The standard nursery tray are about 11"x22" so you build the bench 33, 44, 55 or 66" wide. Mine is up against a wall and it is about 44 wide so I can put two trays on it at once.

Mike

You mean like this? No wheels but holds 4 trays per shelf.

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not built , but bought...cheap plastic shelves..
can't really tell from the pic, but they work..
Home Depot T8 shop x2 light @ 5000k spectrum.

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go to like lowes they have cheap potting benches that you can hang some angle iron or some thing to attach the light and they dont have wheels but u can mount ones on there

Here is a link that might be useful: lowes lite work bench

Macheske, I like your design. I was thinking of building my own as well, care to share your design? I also like how you built the frames to hold several light together and get them wired up. Care to share your wiring diagram as well?