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Old 06-19-2020, 01:25 PM   #6 (permalink)
freebeard
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Quote:
I Have thought of fresnel lenses to turn the output into a parallel beam.
I have fresnel lenses (scavenged from old overhead projectors) in the windows of my place. They throw circular rainbows on the floor and furniture. Back to the sixties!
Quote:
You waste the majority of the light produced.
Most likely, but if the blackout shield were reflective on the inside it would create a plenum.
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optics and electromagnetism were some of my weakest subjects in physics. I'll be useless to you.
I did the experiment, holding a card over the top and bottom of the reflector, before I added the aluminum tape. I use that stuff for anything that would be duct taped now. It doesn't have the tensile strength but it cleans up a lot better at removal. Kind of like that white tape you used at Darko.
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