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282TermLuminous fluxLuminous intensityIlluminanceLuminanceTermPower consumptionEfficiencyColour temperatureCCTAverage colourrendering indexUnit of measurementlm （lumens）cd （candela）lx （lux）MeaningAmount of light. Used to express the amount of light emitted from a light source. Strength of light （amount of light emitted in a unit solid angle in a given direction）.Brightness of surface being lit. Used as a basic guideline in lighting design.Intensity of an object as seen from a given direction. （Where illuminance expresses how much light is reaching a given unit of area, luminance expresses the resulting visible brightness when seen from a given direction.）cd/m2（candelas/square meter）Unit of measurementW （watts）lm/W（lumens/watt）K （Kelvin）MeaningThe power consumption of light source including load of a driverValue derived by dividing the light source’s total luminous flux by its power consumption. In other words, this property indicates the luminous flux （measured in lumens） generated by 1 Watt of power.Numerical representation of the colour of the light generated by the light source. Colour temperature values decrease as light becomes redder and increase as light becomes bluer. Numerical representation of the reproducibility （way of seeing） of the colour generated by the light source. This property serves as an indicator of how faithful the color appears when compared to the reference illuminant （CRI100） established by the JIS standard. The CRI unit is not synonymous with a colour’s desirability; pleasant colours may have low CRI values.CRI（Color rendering index）Terms used to describe the properties of lightTerms used to describe light sourcePHOTOMETRIC DATA GUIDE