Quote Originally Posted by benjiboy View Post
True, but the Ikea Jansjo lamp cleared the yellow caste from my Canon FD 35mm F2 Thorium lens in forty eight hours, and it makes a very useful reading lamp afterwards.
I was struggling to find an appropriate UV source.

Here in LA finding the sun is no problem. But it has been a tad cloudy lately.

Then I remembered a light fixture I have for video production. Ta-da!

The TruColor HS is a remote phosphor LED source that uses panels of phosphor excited by purely UV LEDs.

With the panels removed, 400W of UV light is bearing down on my lenses.

Any guesses how long it'll take to remove the yellowing? A day or two? 20 minutes?