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Rainbow effect (RBE)

RGBspot on wheel: Rshown in slow motion(real: 240 rev/s)One 60 Hz frame = 16.7 ms12 colour fields, 1.4 ms each (equal segments, illustrative)RGBRGBRGBRGB0 ms16.7 ms4 revolutions × 3 segmentsThe eye blends the fields; faster switching shortens each colour's gap.W or CMY segments add light but take time from R, G, B.
Segment layout
Wheel speed (revolutions per frame)
Frame rate
Colour-field switches per second
720
240 rev/s × 3 segments
Colour fields per frame
12
1.4 ms each
Wheel rotation
14,400 rpm
4× of 60 Hz
Show the numbers
Formulaswitches/s = frame rate × revolutions per frame × segments per revolution
LayoutRGB (3 segments, equal angles — illustrative)
Frame60 Hz = 16.7 ms
Switches per second60 × 4 × 3 = 720
Each field lasts1.4 ms
A single-chip DLP colour wheel with RGB segments spinning at 4 revolutions per frame on a 60 Hz signal. That is 240 revolutions per second and 720 colour-field switches per second; each frame of 16.7 ms is split into 12 colour fields of 1.4 ms. Segment angles are equal for illustration; real wheels vary.

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