mini light mover?

Any ideas out there for a micro sized light mover for using with a COB LED fixture? Only looking for about 6" of travel. I've never tried growing with LED's before but imagine there would be hot spots. Anyone can benefit from moving lights if done right. The problem with some is too much time is spent in travel across the middle with no pause at either end so the "taller in the middle" effect can be worse. If you get the mover to pause at either end it can reduce this effect.
My fixture is 17" and have 38" length inside the cabinet but taking into account I have most of my fans on one side knocks down some of that area.
Only idea so far isn't very cheap but a 6" linear motion activator with a controller to push it open and move a hanging fixture - then stop for a minute (or any given time period) then close and let the light return, pause, repeat. It's not nearly as complicated as rails but the main idea I'm working with right now.
Maybe a PWM controller could be used on the linear motion activator to slow it down? I see these cheap chinese motors that don't list the current draw, not sure I want to do that but maybe figure where they exist as surplus.
Any other ideas out there or other suggestions?
It's that or a diffuser which would reduce the amount of light reaching the plants.

You could use a garage door track. Just the track would work for a smaller light but if you have heavier lights then you could use the side rails from a garage door as well. Pretty easy to control the pauses at the end that way too.

I saw a guy using an oscillating fan once he just hooked a bar up to the fan and had it push and pull the fixture as for the ends just elevate them to get an even canopy

3d printers have taken off in a big way, so with $20 you can have the motors and electronics to move most anything anywhere... Linear bearings and 8mm smooth rod makes it a bit more expensive but you don't really need that stuff, just some pulleys, belts and maybe angle iron hdpe dots to slide on.

The boards are arduino and you could custom write code, but the g-code will be really simple too. it would be pretty cool to do 2 or 3 axis light mover too and maybe really efficient with the lighting and electricity usage..


http://www.aliexpress.com/item/New-UNO-R3-Board-CNC-Shield-Expansion-Board-4-x-A4988-Stepper-Motor-Driver-with-Heat/32467589482.html?ws_ab_test=searchweb201556_6_79_78_77_82_80_62,searchweb201644_0,searchweb201560_5

http://www.ebay.com/itm/28BYJ-48-Valve-Gear-Stepper-Motor-DC-12V-4-Phase-Step-Motor-Reduction-Arduino-/200943750388?hash=item2ec92e4cf4:g:1ngAAOxyiOxR5PxP

These are geared down so they would be slow on a 3d printer, but perfect and torquey to move any light with heatsink.

or I would use a door lock solenoid and a lever to get the motion i wanted, but that would basically be 2 binary positions and not quiet.

https://github.com/zenakuten/cameraslide

Example and explanations of a single axis

Osculating Fan, Take off Fan and motor, except the oscillator, mount and it will move in a V shape