colorimeter
[8.5.1] An instrument that measures color in units specific to a color space such as the CIE 1931 Chromaticity Diagram, the CIE 1964 Chromaticity Diagram, CIELAB, or CIELUV. See also […]
center-beam candlepower (CBCP)
[8.6.4.3] The luminous intensity along the geometric centerline of a directional light source. The assumption in application is usually that the centerline candlepower is also the maximum candlepower. Also called […]
isoluminance line
[8.6.6] A line on a surface that shows all the points where the luminance is the same for a given position of an observer and light source(s) in relation to […]
luminous intensity distribution curve
[8.6.5] [See intensity (candlepower) distribution curve.]
lux meter
[8.4.9] [See illuminance (lux or footcandle) meter.]
national standard of light
[8.1.5] (See primary standard.)
reference standard
[8.1.6] (See secondary standard.)
flicker photometer
[8.4.1.8] (See visual photometer.)
footcandle meter
[8.4.8] [See illuminance (lux or footcandle) meter.]
lamp failure
[8.20] The point where a lamp stops operating. Lamp failures from manufacturing defects are reported but not included in the calculation of lamp life. For certain lamp types, other criteria […]
