This ring light is made from plywood. The back plane is 1/2"*21"*21". The sides are made from 1/4" plywood 7" wide. The corners are reinforced with triangular pieces. The hole in the center of the back plane is 11" in diameter. The 4" wide baffle ring was made from some aluminum flashing and held in place with some finishing nails. I have used medium screw base pig-tail sockets for the lamps. I have chosen 6 lamps for this prototype, more maybe required to get the light level higher. Other styles of recepticals could be used without problem. The sockets are wired in parrallel and held in place with some wire staples. The wire was then feed through the 1110 utility box to a normal household switch.
As seen in this view, there is a hole drilled into the back panel to accomodate the lamp and a larger undercut for the pig-tail socket. The depth of the undercut was determined by the pig-tail socket and the base of the lamp. It is just deep enough to keep the lamp from rattling in its place.
This lamp was the only one that I saw which produced a daylight color, I'm sure there are others. This lamp produces 23 watts and has a rating of 6000 hours. It measures 2-1/2" in diameter and 5-1/2" in length.
I'm using a digital camera with this ring light, there is little color correction required of the image and can easily be done in your image software. This image was taken at 1/60 second at f/9 with asa of 200. The subject(panoramic camera) was positioned about 16" in front of the ring light.
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