The Lighting Handbook ZG

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Vydal: ZG Lighting Czech Republic s.r.o

Strana 11 z 244







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11 The Lighting Handbook Luminous flux The luminous flux describes the quantity light emitted by light source. Relevant standards specify the required illuminance (e. It describes the one hand light source’s impression of brightness, and the other, surface and therefore depends to a large extent the degree reflection (colour and surface). Luminous intensity The luminous intensity describes the quantity light that is radiated parti­ cular direction. measure of light source’s economic efficiency. This useful measure- ment for directive lighting elements such reflectors. . Illuminance: E(lx) = luminous flux (lm) area (m2) Luminance Luminance the only basic lighting para­ meter that is perceived the eye. The luminous efficiency the ratio the luminous flux to the electrical power consumed (lm/W). is represented the luminous inten­ sity distribu­ tion curve (LDC). Abbreviation: Phi Unit: Lumen Abbreviation: Unit: Candela Abbreviation: Unit: Lux Abbreviation: Unit: cd/m2 Illuminance Illuminance describes the quantity luminous flux falling on a surface.g. 12464 “Lighting indoor workplaces”)