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Re: MissMinerva's question on focused lighting. I like to play around with clamp lamps and colored bulbs and such to get different effects. Nothing useful, it's just fun. I tried one of the regular "spotlight" bulbs you can pick up anywhere, and it did not focus enough. I was thinking of trying for a kind of theatrical spot-light effect. There are fancy miniature spotlights used in museum dusplays, and there are some used in medical applications, but they all sound like a lot of $$$$. I was wondering if anyone has a DIY solution for a focused beam of light? (I hope this isn't considered "thread-highjacking", you don't mind, MM, do ya?)
 

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Thank you, m'dear, most gracious of you.

I think I already know the answer: in order to get a really focused beam of light you need an elliptical reflector and a lens. That would keep most of the light off the glass, where you don't want to grow algae.

Now, all I gotta do is fabricate a perfect parabola out of tinfoil, then take that magnifying glass from the Cracker Jack box.....
 
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