Shaped Spotlight ??
Is this obtainable, a shaped spotlight with a 16" x 12" pattern at 5' from the ceiling? ...Jim Thompson
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Well, yeah; contact Zenni optical with a prescription for a lens with the right focal length, and cylinder, to form that image of a 1cm square 10W LED (actually, these are multi-LED arrays). If you place the lens 5cm from the LED, though, it calls for a 20.7 diopter lens (kinda strong). Maybe you can get one or two of those credit-card size Fresnel lenses to do the heavy focus, just do the cylinder and minor correction in the custom lens.
For proof-of-concept, a slide projector and an opaque slide with the right cutout (and perhaps a zoom lens) can get it done so you can admire the effect. If your ceiling is a dropped type, there would be room for the projector and a mirror above the tile, and you could make it look pretty enough.
Track lighting? You could point multiple spots to form the beam.
Cheers
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Restaurants sometimes use something like that to project onto the sidewalk. They look a bit expensive.
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aim at the ceiling at approx 40 degree angle (50 degrees from perpendicular) with a circular spot
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This style is used in TV studios to do what you want. There are cheaper, and more expensive versions, depending on the required light level. I saw scaled down versions in deparment stores, a few years back.
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