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DIY LED Projector : 6 Steps (with Pictures) - Instructables
DIY LED Projector : 6 Steps (with Pictures) - Instructables
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DIY LED Projector Rectangle Concentrating Lens with Stand Lens Power LED lamp | eBay
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1PC 62x52mm DIY Projector Rectangular Condenser Lenses Projector Lens with Bracket High power LED Condenser Plano Convex Lenses|plano convex|convex lensled condenser - AliExpress
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The Value of Condenser Lenses in Projection Systems - Knight Optical