Continuing the posts about artificial lighting, we'll talk about two important concepts for the choice of a lamp: luminous flux and color temperature.
Luminous flux
Luminous flux is the amount of radiant energy emitted for a time and evaluated according to the sensation of that light produced. The unit for luminous flux is lumen (lm).
With the luminous flux of a lamp, you can calculate it's luminous efficiency. This efficiency is given by η= Luminous flux/Radient flux. In general, we extend the concept of luminous flux to electrical power absorbed by the source.
Color temperature
Another important concept to lighting is color temperature. The color temperature defines the predominant color emitted by a lamp. For calculation, a lamp can be compared to a blackbody. It's color temperature is the same temperature that emanates from a blackbody that emits the same luminous flux in the same intensity.
A high temperature light would be white. For matters of comparison, a color temperature of 5800K is equivalent to sunlight of midday, in summer with open air. While an incadescent light has 2700 K and a yellow color.
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