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Homemade 22w Circline adapter I made this thing last weekend with fellow collector Lumex120 in an attempt to design a better Circline adapter as most tend to be non-servicable and under powered. There's another half complete one that we didn't have time to finish up, Lumex will finish assembly on that one at a later date. This particular model is based off a 4" octagon electrical box, featuring an F25T12 choke ballast and replaceable starter socket. This unit is quite heavy and the design of the clips needs some fine tuning as they tend to hold the tube quite tight. Otherwise it came out pretty decent for a first go around prototype. Keywords: Gear

Homemade 22w Circline adapter

I made this thing last weekend with fellow collector Lumex120 in an attempt to design a better Circline adapter as most tend to be non-servicable and under powered. There's another half complete one that we didn't have time to finish up, Lumex will finish assembly on that one at a later date. This particular model is based off a 4" octagon electrical box, featuring an F25T12 choke ballast and replaceable starter socket. This unit is quite heavy and the design of the clips needs some fine tuning as they tend to hold the tube quite tight. Otherwise it came out pretty decent for a first go around prototype.

Twin-City-Illuminations-FC8T9-Adapter.jpg 400w-Lifeguard-lit.jpg 400w-Lifeguard-unlit.jpg Wotan-Sox-Lamp.jpg
Lamp/Fixture Information
Manufacturer:Twin City Illuminations
Lamp
Lamp Type:Fluorescent
Base:G10Q
Shape/Finish:FC8T9
Burning Position:Any
Fixture
Fixture Type:Fluorescent
Ballast Type:Reactance choke
Socket Type:E26
Electrical
Wattage:22W
Voltage:120V
Physical/Production
Factory Location:Kansas City, MO
Fabrication Date:June 22nd 2025
Application/Use:General lighting
File information
Filename:Twin-City-Illuminations-FC8T9-Adapter.jpg
Album name:Bulbman256 / Projects
Keywords:Gear
Filesize:231 KiB
Date added:27 Jun 2025
Dimensions:1280 x 960 pixels
Displayed:57 times
URL:https://trad-lighting.net/gallery/displayimage.php?pid=898
Favourites:Add to Favourites

Comment 1 to 4 of 4
Page: 1

Max   [Fri 27 Jun 2025 at 08:22]
Nice project, but watch out for a potential risk of electrocution as your metal box is certainly not grounded.
Bulbman256   [Fri 27 Jun 2025 at 21:09]
A grounding strap that bolts for the fixture would be a pretty good idea... Wonder We'll have to consider that in the next design. Cool
Max   [Sat 28 Jun 2025 at 08:31]
Or do like CFL manufacturers did, use a plastic casing instead of metal (check for the fire resistance rating of the material used though).
347vPowerlite   [Sun 24 Aug 2025 at 16:09]
I've seen some older circline adapters use a metal enclosure, but a plastic casing would probably be safer. If you can find a enclosure with a UL94 V-0 rating it should be flame resistant enough.

Comment 1 to 4 of 4
Page: 1