The Lighting Handbook ZG

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Vydal: ZG Lighting Czech Republic s.r.o

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