What is the best slide projector? Slide projectors have been around for well over a century, providing the opportunity to take images and display them on a bigger screen for clearer viewing.
If you’re above a certain age, you probably remember the atmosphere of a pre-Powerpoint 35 mm slide show. The wobbly screen being unrolled, the darkened room, the soft hum of the projector’s fan, the ...
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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