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Jay Young

Building small beam projector

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I’d love to build or have built some small beam projectors. 
 

anyone have any experience? I’m having trouble finding sources for reflectors. 
 

I would really like something less than 1000 watts, preferably like in a small pepper or tweeties housing. 
 

thoughts? 

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I'm not sure if there's a practical difference between a beam projector and a profile (er, ellipsoidal.) The results are arguably fairly similar, but a beam projector like a Molebeam where the entire optical system consists of a single parabolic reflector (and perhaps a few baffles) is, I'd think, likely to be quite a bit more efficient. Less flexible, though.

From what I've seen, a Molebeam or similar is designed to project as near to a parallel beam of light as possible. Most Source Fours, Dedos, etc, won't really do that, although I suspect that in many situations that might not matter too much. However, I have often seen them used to do things like sunbeams through windows, often in haze so it's visible. In this situation it is much more correct to have a near-parallel beam, given the effectively infinite distance of the sun. The limiting factor is of course the diameter of the reflector; for really correct results the reflector should be larger than the window (for instance) you're projecting the light through. For that reason I'm not sure if a small beam projector really makes that much sense unless you have a specific application in mind - you might just as well go and buy some Source Fours.

I bought old (late 90s) Coemar Centro and converted them to 150W ceramic.

P

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I agree -- the pattern of a Molebeam isn't great, the main advantage is just getting a lot of light concentrated in a beam. On a smaller scale, a spot Parcan or a Source-4 Leko is probably better.

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A spot par can is probably the likely choice I guess. I just wanted something Physically smaller than a Leko. 
 

I’m going to keep working on my end, thanks for the suggestions.  

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Coemar Centros are physically smaller than most lekos, and they're not the only small type. There are miniature Source Fours, too. Small optics do start to suffer a quite noticeable efficiency falloff, though.

P

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I've used those miniature lekos before, they are great.

Anyhow, I'm still going to build a small beam projector. I'll let you know how it goes.

 

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