Birds-of-paradise are even colorful in the dark, with feathers and body parts that glow a brilliant yellow-green under ...

One quick fix is to use blue light filtering glasses, but researchers at the University of Houston have been working on a much neater solution: a new violet LED chip that uses much less blue light.

Board-certified dermatologist Rebecca Marcus, MD, says research on this is still in its early stages, but it's thought that like ultraviolet (UV) light, blue light causes damage over time.

You can use a prism to split (or disperse) white light into a spectrum of colours: red, orange, yellow, green, blue, indigo and violet. Dispersed means that the colours are separated out.