Who hasn’t thought about turning a 1950s slide projector into a digital projector? [Matt] did, but unlike most of us, he actually did it. [Matt]’s friend [Angus] found an old, single-slide, ...
From the bare bulb or out the lens? Out the lens, practically none. Most glass attenuates UV very well. Same for a fluorescent lamp. You need special glass to pass significant amounts of UV.
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