- Colour Temperature
When the chromaticity of a light source is the same as that of a blackbody at a certain temperature, the absolute temperature of the blackbody is the color temperature of the light source. Also known as “color.” The unit is on (K).
- Correlated Colour Temperature
When the color point of the light source is not on the blackbody locus, and the chromaticity of the light source is closest to that of the black body at a certain temperature, the absolute temperature of the black body is the correlated color temperature of the light source. The symbol is Tcp, and the unit is Kelvin(K).
- Chromaticity Tolerances
Characterization of a number of light sources in all the light source and the color deviation of the rated color, denoted by Standard Deviation of Color Matching (SDCM).
- Luminous Flux Maintenance
The ratio of the luminous flux of a light source to its initial luminous flux after a given ignition time.
The ratio of the reflected radiation flux or luminous flux to the incident radiation flux or luminous flux in a given state of the spectral composition, polarization state and geometric distribution of the incident radiation.
- Lighting Power Density (LPD)
Installed power per unit area (including lighting, ballasts or transformers and other ancillary electrical devices), in watts per square meter (W / ㎡).
- Room Index
The room or place the value of the geometric shape, is 2 times the value of the room or site area and the room or place the level of the perimeter and lamp installation height and the difference between the height of the work surface.
- Annual Lighting Exposure
Measures the annual cumulative illuminance value of the object, expressed as the product of the illuminance received by the object and the cumulative hours of the year, in lux per year (lx • h / a).
- Color Vector
The TM-30-15 provides a dual-index feature along with a color vector graph that provides a more intuitive message for color shifts and saturation changes for various colors.
- Color Purity
The color purity is the auxiliary expression when the color is described by the dominant wavelength. The chromaticity is defined as the chromaticity coordinate of the part to be measured and the chromaticity of the E light source (ie, the white light source and so on can be shown as the white point on the figure) The linear distance of the coordinate, the percentage of the distance from the E light source to the spectral wavelength of the main wavelength of the DUT, the higher the purity, the closer the chromaticity coordinate of the DUT to the spectral wavelength of the dominant wavelength.