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 5 mm Yellow Diffused LEDs Pack of 20 L05YD  US $1.85
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 5 mm RED Diffused LEDs Pack of 20 L05RD US $1.85
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 5MM Red Blinking LEDs Diffused Lens Package of 3 US $1.25
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 3 mm Red Ultra Bright Diffused LEDs Pack of 20 US $1.95
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 3 mm Pure Green Ultra Bright Diffused LEDs Pack of 20 US $1.95
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 3 mm Green Ultra Bright Diffused LEDs Pack of 20 US $1.95
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 3 mm Yellow Ultra Bright Diffused LEDs Pack of 20 US $1.95
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 5 mm 12 Volt Yellow LEDs Diffused Lens Pack of 5 US $1.50
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 5 mm 12 Volt Green LEDs Diffused Lens Pack of 5 US $1.50
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 5 mm Yellow Diffused LEDs Pack of 20 L05YD US $1.85
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 2 mm Pure Red Diffused LEDs Pack of 20 L02PRD US $1.85
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 2 mm Red Pure Green 3 Lead Diffused LED Pack of 100 US $18.50
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 5 mm Red Green Diffused LEDs 3 Lead Common Cathode US $2.00
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 2 mm Red Diffused LEDs Pack of 20 L02RD US $1.75
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 2 mm Green Diffused LEDs Pack of 20 L02GD US $1.75
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 3 mm Red Diffused LEDs Pack of 20 L03RD US $1.75
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 2 mm Yellow Diffused LEDs Pack of 20 L02YD US $1.75
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 3 mm Purple Diffused LEDs Pack of 5 L03PD US $1.75
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 2 mm Red Green 2 Lead Diffused LED Pack of 100 US $18.50
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 3 mm Blue Diffused LEDs pack of 5 L03BD US $1.95
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 5 mm 12 Volt Red LEDs Diffused Lens Pack of 5 US $1.50
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 2 mm Orange Diffused LEDs Pack of 20 L02OD US $1.75
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 5 mm Red Green Diffused LEDs 2 Lead Pack of 10 US $2.00
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 3 mm Green Diffused LEDs Pack of 20 L03GD US $1.75
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 3 mm Yellow Diffused LEDs Pack of 20 L03YD US $1.75
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 5MM Yellow Blinking LEDs Diffused Lens Package of 3 US $1.25
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 2 mm Red Green 2 Lead Diffused LED Pack of 10 US $1.75
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 5MM Green Blinking LEDs Diffused Lens Package of 3 US $1.25
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 5MM Blue Blinking LEDs Diffused Lens Package of 3 US $1.25
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 5MM Orange Blinking LEDs Diffused Lens Package of 3 US $1.25
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How to reduce light diffusion around focused image?
I'm doing an experiment where I am shining an infrared LED through a single element lens (plano-convex lens) onto a surface which is about 3 inches away. I've placed a little square in front of the LED and I'm projecting the square image to the 3 inch surface. The square is nicely focused onto the surface however there are faint blobs of diffuse light emminating from the the squre edges. Can anyone please inform me as to the cause of this and if there is a solution with a single lens. Thank You.
I assume the infrared LED is not so infra that you can't see it. If it's not monochromatic you may be getting chromatic aberration. Or you may be having edge effects from the square or irregular translucence (maybe paper fibers?) at the surface.
5mm RGB Flat Top Diffused LED.MPG