LED retrofit for fluoro illuminated magnifying lens lamp?

[e100]

The donut shaped fluorescent tube in my old magnifying desk lamp has died so I was wondering if anyone in a similar situation has tried doing a retrofit using LEDs.
The magnifying lens is 120mm in diameter and the lamp housing is 220mm in diameter so I've got about 45mm or so room for the LEDs.
The original bulb was 22 watts. Do you think a bunch of multicolour LEDs like the WS2812 would do the job?

[SeanB]

Order a LED ring light of the right diameter on Ebay and a power supply for it, or just get a few pieces of your favourite colour white LED tape and some aluminium strip to act as support for them, plus a 12V supply.  Otherwise the 22W circline is still available, and quite cheap.

Alternative is to cut a circular piece of aluminimum sheet that replaces the light, and get a whole load of 3W star led units, and use some epoxy to attach them to the sheet, and cut a diffuser from thin white acrylic to diffuse the light. Then get a LED power supply appropriate for the unit and install it in the top, leaving the original ballast in the base to provide mass.

[Nusa]

Search for "LED circular tube". You're probably looking for the 8 inch ones, for those that aren't advertised in metric.

You can find LED direct replacements, simply plug and play using your existing ballast. Old ballast must work, of course.

Or you can get the same thing with a ballast replacement power supply (wiring required). You'll have to find a place to put that, should it turn out to be bigger than what it's replacing. Usually a bit cheaper than the above.

There are also flat LED ring PCBs that do pretty much what you're thinking of. Most of the ones I've seen are for ceiling lights that assume they can put the power supply in the middle, so that might be an issue. Buying a cheap round LED ceiling light and removing the guts may be a fast way to get one of these.

And, there's DIY. If the project is the real goal here, go for it! Many different ways to do it. Have fun! The numbers you need to compare with the old bulb isn't watts, it's lumens. The LED replacement will consume fewer watts for the same lumen output. Color temperature is another thing you need to decide on. You can pick something specific, or you can mix in several different types of LED's to get a wider spectrum.