Quick Answer: The Colour Shadow Apparatus uses independent red, green and blue LED light sources to show additive colour mixing and coloured shadows. Each LED has its own intensity control.
Last updated: October 2026
Key Features
Independent red, green and blue LED array
Potentiometers for variable intensity of each colour
Adjustable beam convergers to overlap the beams
Shows cyan, magenta and yellow where two beams overlap, and white where all three meet
Technical Specifications
Specification
Value
Light source
Independent triple LED array: red, green, blue
Controls
Potentiometers for variable intensity
Alignment
Adjustable beam convergers
About This Product
Placing an object in the overlapping beams casts coloured shadows, each missing one of the three primaries, which makes additive mixing easy to see. Students mix the secondary colours cyan, magenta and yellow and build white light from red, green and blue.
Frequently Asked Questions
Can the brightness of each colour be changed?
Yes. Integrated potentiometers give variable intensity for the red, green and blue LEDs.
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