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8 years ago

eBay 100W LED Collimator and reflector, unboxing review

Films4You
eBay 100W LED Collimator and reflector, unboxing review.

A collimator is a device that narrows a beam of particles or waves. To "narrow" can mean either to cause the directions of motion to become more aligned in a specific direction (i.e., collimated or parallel) or to cause the spatial cross section of the beam to become smaller.

http://en.wikipedia.org/wiki/Collimator

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