Where can I buy UVC/ Germicidal light bulbs with different wavelengths?

I am doing a science fair project that involves UVC lights with different wavelengths, but I can only seem to find stores that sell one type.

UVC sources are available in cold cathode, floro and metal halide technologies.

Low pressure mercury discharge used in the floro and cold cathode sources has lines at 185 and 254nm. The tubes are readily available in 254nm only or 185 and 254nm mixed. I don’t have a US source, but I bet the Thomas register does.

The 185nm line will produces ozone if operated in air so precautions are advised to deal with this toxic and corrosive gas.
Needless to say, both lines will cause radiation damage to skin (including cancer) and eyes (cataracts (and retina damage at 185nm)), so appropriate precautions should be taken to minimise the radiological hazard.

On the high intensity side, I have been unable to locate details of the spectrum of the metal halide sources, but would be surprised if they differed massively.

Finally, a simple home made carbon arc lamp will produce broadband radiation including uvc, so if you have a grating on a quartz glass substrate, that might be a viable source. Suitable carbons can be had from your local cinema suppliers.

HTH.

Regards, Dan.

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