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Spectral power distribution and you

Spectral power distribution is a visual representation of color outputs from a light source. Light, known as the visible spectrum, consists of all of the waves the human eye can see. It is a small part of the entire electromagnetic spectrum comprising x-rays, microwaves, infrared waves, radio waves, long radio waves, ultraviolet rays and gamma rays. The human eye can see light with wavelengths from about about 380 to 760 nanometers. A SPD curve shows how much of each of the visible waves is emitted from a light source.

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Lighting up our world: How we see

When you look at an object, such as your bedside table lamps, you’re seeing light. Of course, it may only appear that the bulb itself is directly projecting light. However, everything you see results from illumination, whether from the sun or an artificial source. This is why you can’t see objects in the dark.

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