The Lighting Handbook ZG

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Vydal: ZG Lighting Czech Republic s.r.o

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11 The Lighting Handbook Luminous flux The luminous flux describes the quantity light emitted by light source. is represented the luminous inten­ sity distribu­ tion curve (LDC). 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). 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).g. 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. . This useful measure- ment for directive lighting elements such reflectors. Luminous intensity The luminous intensity describes the quantity light that is radiated parti­ cular direction. 12464 “Lighting indoor workplaces”). Relevant standards specify the required illuminance (e. measure of light source’s economic efficiency