ive been looking for a cheap light mover since i was last using an indoor room, although Im not using any indoor grow rooms now I thought this might help anyone who is.
Finally an affordable light mover!
I just saw this chain driven design, and its a lot cheaper than most movers out there (like all the ones I see @ $225 a pop)
Hydrofarm Light Track from 4 hydroponics.com by Growco Indoor Garden Supply 
The Hydrofarm Light Track slowly moves your grow light fixture back and forth along its 4-foot length, providing a more even level of brightness throughout the plants.
Travel time from one end to the other is about 13-1/2 minutes.
The movement of a grow light also helps eliminate shadows between plants to encourage even growth throughout your garden.
The 4' Hydrofarm Light Track provides a simple, yet effective method of operation. Using a Swiss-made motor, the light bracket is chain driven from one end the metal rail to the other. After a slight hesitation, the direction reverses.
All installation hardware is included. We recommend lubricating the inside of the (rail) track grooves every 90 days to maintain smooth operation.
1 year warranty
Hydrofarm Light Track - 4 foot
$99.95
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