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Old 06-19-2020, 11:52 AM   #2 (permalink)
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optics and electromagnetism were some of my weakest subjects in physics. I'll be useless to you.
The 'bottom' of the parabolic reflector can be a source of light pollution though.
Some of the 'blackout' schemes for headlights in WW-II involved shielding all but the center of the lamp.
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