http://www.outdoorlanternsonsale.com/white-light/
Why use a white light instead of turquoise?
After doing some research via the internet, I found out about luminous efficacy. The rods in the human eye have the highest luminous efficacy at 507nm, which is close to a turquoise color. Since this color gives us a better visibility, why do we use a white light instead of turquoise? For example, car lights use a white light and their main purpose is to increase vision at night. Using a turquoise color would not only be more efficient, but consume less power.
Turquoise will only illuminate blue-coloured objects. No other light would be reflected, so any non-blue objects will appear black. That would make visibility a huge problem.
Look at anything under a street lamp, which is yellow due to sodium. Anything non-yellow will appear either black or grey. Anything with yellow tints will appear yellow. This is because only the yellow would be reflected, and there is no other colour to reflect. Turquoise lights would have the same problem: only one wavelength present.
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