The Lighting Handbook ZG

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Vydal: ZG Lighting Czech Republic s.r.o

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The luminous efficiency the ratio the luminous flux to the electrical power consumed (lm/W). This useful measure- ment for directive lighting elements such reflectors. Relevant standards specify the required illuminance (e. 12464 “Lighting indoor workplaces”). 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. 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. 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). measure of light source’s economic efficiency.g. . Luminous intensity The luminous intensity describes the quantity light that is radiated parti­ cular direction.11 The Lighting Handbook Luminous flux The luminous flux describes the quantity light emitted by light source