Color and Mood. ENERGY STAR certified bulbs are available in a wide variety of shades of white light, ranging from yellowish, to white, to bluish white light, which allows you to customize the mood of your space.
The eye detects visible light, the nerves detect infrared or heat and the skin is sensitive to ultraviolet ( tanning and sunburn ) and the lens of the eye develops cataracts in response to UV also. a human body can detect ionizing electromagnetic radiation, if he can see what his geiger counter is reading.
Electromagnetic radiation (ER) in this range of wavelengths is called visible light or just simply light. Human eyes can see wavelengths from about 390 to 750 nanometers (billionths of a meter, abbreviated nm). 1 nm = 40 billionths of 1 inch, a very tiny unit of length.