![]() ![]() The diagram below illustrates the meanings of these different terms: luminance (measured in nits, candela/m 2), luminous intensity, luminous flux (measured in lumens), and illuminance (measured in lumens/m 2, aka lux). Lux is an essential consideration for interior lighting design for spaces where humans live and work. Illuminance refers to the amount of light that shines onto a surface, measured in lumens per square meter (lm/m 2), also called lux. Luminous intensity is a measure of the light that shines from the source in a given direction. We quantify luminous flux in units of lumens (lm), a photometric unit of measurement. The temperature of the star: If two stars are of the same size but have different temperatures, then the star with a higher temperature will be more luminous than the star with lower temperatures. ![]() Luminous flux is a measurement of the total amount of light a light source emits, integrated over the entire angular span of the light. The size of the star: The larger a star is, the more energy it puts out, and the more luminous it is. The amount of light emitted from or reflected off an object is called its luminance-commonly referred to as brightness. They are described by their energy or, inversely, by their wavelength. The radiation of light is made up of sub-atomic particles (photons), which have no mass but are simply carriers of energy. b. Electromagnetic radiation of any frequency or wavelength.īeyond this basic definition, we have tools and language to precisely describe, quantify, and analyze the electromagnetic waves (visible and invisible) that are all around us, emanating from the sun, from flames, and from artificial sources such as light bulbs. a. Electromagnetic radiation that is visible, perceivable by the normal human eye as colors between red and violet, having frequencies between 400 terahertz and 790 terahertz and wavelengths between 750 nanometers and 380 nanometers. Also called visible light. The American Heritage Dictionary tells us: ![]()
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