The Lighting Handbook ZG

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Luminous intensity The luminous intensity describes the quantity light that is radiated parti­ cular direction.g.11 The Lighting Handbook Luminous flux The luminous flux describes the quantity light emitted by light source. 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). The luminous efficiency the ratio the luminous flux to the electrical power consumed (lm/W). Relevant standards specify the required illuminance (e. Illuminance: E(lx) = luminous flux (lm) area (m2) Luminance Luminance the only basic lighting para­ meter that is perceived the eye. is represented the luminous inten­ sity distribu­ tion curve (LDC). This useful measure- ment for directive lighting elements such reflectors. 12464 “Lighting indoor workplaces”). measure of light source’s economic efficiency. . 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