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You can find them in most old or broken 3LCD projectors. I found such lenses in "Sanyo PLC-XW55". You can also do something similar by making a filter with many small diameter focal length LED lens. :)
Hi, I apologize for the problem.I updated the "Programming" step where I showed how to deal with such a problem. And I've uploaded a new file to Arduino. :)
Portable Led Projector for Light Effects
Portable Led Projector for ...View Instructable »