I'm trying to think of a way to make a rotating (spinning) vertical LED bar. You place it in the center of a mylar tube and voila, instant COB vert grow.
I had a good long conversation with a guy who has built a spinning light fixture with HID lamps. It moved FAST, like 120rpm! His rationale was that it prevented heat buildup.
The problems were many;
It had sharp edges and hot lamps and any contact with other objects was a recipe for instant disaster. I know people who got cut on their heads just standing up in the wrong spot.
It would spin so fast that the lamps did not properly warm up to operating temperature, adversely affecting efficiency, spectrum and lamp life.
It used brushes in the hub to transfer AC power to the rotating arms; the ballasts were on the arms with the lamps and reflectors. This meant that it could not be UL listed. The brushes would eventually wear out and could easily damage the ballasts near their end of life.
I never saw his system again. I think it was simply too fucking dangerous.
I built a light rotator many years ago from a mountain bicycle. The fixture made one rotation every three and a half minutes, plenty of time to get out of the way. It did not carry the ballast and it did not need brushes to transfer power to the lamp.
Distributed lighting from multi chip LED lights is still better.
Finally, spinning a light in the middle means you must grow in a cylinder shape- which sucks for lots of reasons, like being hard to work inside and pie wedge leaf shading issues. Flat panels are sooooo much better!
I see this idea pop back up every once in awhile. It was a good idea for its time- and that time is now thankfully behind us.
