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how to collimate or focus white light to a distance of 19 cm or 33 cm?


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Have you considered 3 (R,G,B) lasers into a prism, as projection televisions light engines have, without the LCD panels ?

 

----> http://cdn.avsforum.com/b/bf/1000x500px-LL-bf439461_Sony_3LCD_Laser-1024x476.jpeg

 

----> http://images.amazon.com/images/G/01/electronics/brands/sony/xbr/sxrd-optic-sim.jpg

 

I have a couple of the light engines pulled from projectors and would seem to work for your needs.

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