Luminous efficacy — is a measure of how well a light source produces visible light. It is the ratio of luminous flux to power. Depending on context, the power can be either the radiant flux of the source s output, or it can be the total electric power consumed by… … Wikipedia
Coefficient of utilization — A coefficient of utilization (CU) is a measure of the efficiency of a luminaire in transferring luminous energy to the working plane in a particular area. The CU is the ratio of luminous flux from a luminaire incident upon a work plane to that… … Wikipedia
Luminous energy — In photometry, luminous energy is the perceived energy of light. This is sometimes also called the quantity of light.Luminous energy is not the same as the radiant energy, the corresponding objective physical quantity. This is because the human… … Wikipedia
Coefficient of elasticity — Elasticity E las*tic i*ty ([=e] l[a^]s*t[i^]s [i^]*t[y^]), n. [Cf. F. [ e]lasticit[ e].] 1. The quality of being elastic; the inherent property in bodies by which they recover their former figure or dimensions, after the removal of external… … The Collaborative International Dictionary of English
coefficient of resistance — Elasticity E las*tic i*ty ([=e] l[a^]s*t[i^]s [i^]*t[y^]), n. [Cf. F. [ e]lasticit[ e].] 1. The quality of being elastic; the inherent property in bodies by which they recover their former figure or dimensions, after the removal of external… … The Collaborative International Dictionary of English
Emission coefficient — is a coefficient in the power output per unit time of an electromagnetic source, a calculated value in physics. It is also used as a measure of environmental emissions (by mass) per MWh of electricity generated, see: Emission factor. Scattering… … Wikipedia
utilization coefficient — noun : the fraction of the total luminous flux from the lighting equipment of a room or office that falls upon areas (as desks or tables) where it is actually utilized … Useful english dictionary
Candela — This article is about the unit of luminous intensity. For other uses, see Candela (disambiguation). Photopic (black) and scotopic[1] (green) luminosity functions. The photopic includes the CIE 1931 standard[2] … Wikipedia
Lux — For other uses, see Lux (disambiguation). A lux meter for measuring illuminances in work places. The lux (symbol: lx) is the SI unit of illuminance and luminous emittance measuring luminous power per area. It is used in photometry as a measure of … Wikipedia
Light — For other uses, see Light (disambiguation). Visible light redirects here. For other uses, see Visible light (disambiguation) … Wikipedia
