Third Order Fresnel Lens

The South Manitou Island Lighthouse is lit by a single 100 watt compact fluorescent household light bulb. Due to the focusing power of the third order fresnel lens, I could lay inside my tent a mile away, and see shadows created by the beam of light.

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Comments

nasunto says:

That's pretty impressive! Maybe I need one of these for my living room to make better use of the compact fluorescents in my lamps.
Posted 5 months ago. ( permalink )

forestlady (busy) says:

This is really something. Thanks for sharing!
Posted 5 months ago. ( permalink )

patrick j garrett says:

hey nasunto, I think this one cost something like $80k, not real suitable for your basic living room. but CFL's are a good idea :)
Posted 5 months ago. ( permalink )

Sentrawoods. says:

I've always wondered what the lights looked like up close. I had no idea how advanced they were but then again they would have to be to shine as they do. Very interesting.
Posted 5 months ago. ( permalink )

Sunnyday14 says:

really pretty.....
Posted 5 months ago. ( permalink )

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Taken with a Canon EOS Digital Rebel XSi.
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Taken on June 30, 2009
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