What you want is, first, a strong source and second parallel rays (not radial rays like omnidirectional light bulbs). The later is the hard part. Because of con

What you want is, first, a strong source and second parallel rays (not radial rays like omnidirectional light bulbs). The later is the hard part. Because of conservation of etendue, (https://en.wikipedia.org/wiki/Etendue#Conservation_of_etendue https://en.wikipedia.org/wiki/Etendue#Conservation_of_etendu...) it's difficult to have very parallel rays unless the source is small and/or far away. Most spotlights still have relatively wide angles of radiation. I wonder if something like this might work if well placed: https://www.amazon.com/Primelux-8-inch-14400-Lumens-Driving/dp/B01GZST326/ref=sr_1_4?keywords=spotlight+jeep&qid=1574988540&sr=8-4 https://www.amazon.com/Primelux-8-inch-14400-Lumens-Driving/...