[Greg McKaskle]

I think the best light is the one that is the most unique, bright, and that the sensor is sensitive to.

Camera sensors tend to be more sensitive to reds and greens and less sensitive to blues. This is done to mirror how human eyes perceive color. So with LEDs of the same intensity, blue may not be reported as high as the others.

LEDs are based on photon emission from various circuits. When I was a kid, all LEDs were red, no other colors available. Today, there are all colors, but the cost and brightness per cost still differ.

All together, I'd say that the color probably doesn't matter much.

If you use HSL or HSV color thresholding and a relatively narrow hue filter, you should not have that many issues with other colors. But that is why the examples also do shape and size filtering. To interfere, something has to be the right color, right blob size, aspect ratio, it has to be pretty square and hollow.

Greg McKaskle