The balance of colors in light is measured as color temp on the Kelvin scale.
Imagine a bar of steel in a forge for example. When the bar is at 2000 degrees, it will be dark red, as it gets higher in temp it begins to get brighter going from red, to orange, to yellow, to white, and then even to blue-white up past 6000 degrees.
The green (or pink, or other colors) from fluorescent bulbs comes from the glowing gases used in the bulb.
Electric flash has a higher color temp than the sun, so it tends to be a bluish-white light, which can be corrected by using a warming filter or a gold reflector. As stated in an above post, the sun is at 5000. Most electric flashes are approx 6000 degrees color temp.
Skylight without direct sun can have a very high color temp (up to 10000+).
A candle is approx 1900
Flash bulbs if any one is using them are approx 4000 degrees color temp.