My 6-light CFL fixture worked well in the studio, but I wanted more light and the option to add a light modifier. I decided to move up to 3” PVC and install eight lamp sockets around the outside of the pipe.
We’re going to call this fixture a SPIDER, you’ll see why in just a moment.
Here is my original collection of parts.
A 3” clean-out plug serves as a hub for the sockets. My original idea was to attach the clean out plug to a 3” bushing that would be attached to the front of the 2” tee fitting. The power cord would run out the back of the tee and the light stand would attach to the base of the tee.
I measured and marked the clean-out plug and drilled it with a 5/16” bit. I made a simple jig from scrap wood to hold the fitting in place.
Using a 2” lamp nipple and a pair of channel locks, I carefully cut the threads for the shorter nipples. This is where the working characteristics of PVC came into play. You can cut threads into PVC with a bolt and a little patience, instead of using a tap and die. I chased the threads all the way through the side of the fitting.
Here is the clean-out plug with all of the lamp nipples fitted. I chose a clean-out plug as opposed to a regular cap so that I could access the wires more easily.
Each socket was wired and the wires passed through the hole of the mounting bracket. The design of the bracket and the lamp nipples allowed me to keep all of the wires hidden.
Above is the front of the SPIDER WITH the wiring in place.
Above is the back of the SPIDER with the wiring in place. The sockets were wired in pairs, then the pairs were wired together. I used wire connectors instead of soldering so that a socket could easily be replaced if it failed.
LOOK; it works!
At this point I realized that my original design was way too front-heavy. I needed to move the center of gravity farther back. So, I’m off to Home Depot yet again.
I found a 3”-3”-2” tee fitting that solved my problem of balance nicely. I added a 3” to 2” reducer to the back of the tee fitting and a 2” to1.25” threaded reducer to that. A 4” circle of plywood and a 1.25” male fitting is attached to the reducer and this holds the speedring to my Paul C Buff OCTOBOX™ firmly in place. A 2” to .75” threaded reducer is mounted at the bottom of the tee for the light stand fitting.
Here’s the light inside the OCTOBOX™. It throws a very even lighting pattern, even without the diffusion panel. It’s well balanced and easy to handle in the studio. I’m working on an improved version for my still photography. Stay tuned…
Director of Design
Aarthun Performance Group, Ltd.