I designed a softbox speed ring adapter for an LED light bulb (https://www.thingiverse.com/thing:4794711) and realized that I made the base vertical, so I came up with this adjustable angle adapter that works perfectly. As long as your light isn't too heavy, this angle adapter will allow you to easily tilt the light at various angles.

When you print, I recommend that you print 100% fill so the parts are strong enough to support your light. Also, lay out the three parts as shown in the image and use supports.

I have found that although this device works really well, the threaded bolt tends to break off with use. I plan to re-work this design in the future to have some sort of nut and bolt from the hardware store to increase the strength for the wear and tear of daily use. I have been asked to include the Fusion 360 file in case anyone wants to mess around... if you do, please pass along credit to me for the original design.