The colour of light, which range from the orange glow of a candle into the glowing blue light of this sun, is known as colour temperature. Color temperature doesn’t have anything to do with bodily heat. The colour temperature scale is much backward in the ambient temperatures scale: the lower the colour temperature, the warmer weather (or orange) the lighting is more; the higher the color temperature, the warmer (or longer blue) the lighting is. Measured in degrees Kelvin, many lights have colour temperatures involving 2700K along with 6500K, and also the specific colour temperature you desire is dependent upon your area and use. Have a look at picking color temperatures to get more information.