Sometimes this meter is referred to as
'Candela' light meter because candela is printed on the left lower side
of the scale. However this is the value the meter is measuring and is
not the name or type of the meter. It actually is the TriLux
meter. There are different Lux meters made by Gossen as TriLux. The
difference is the value on the scale and the measurement range of the
meter. See TriLux for more information.
"The candela (symbol: cd) is the SI base unit of luminous intensity; that is, power emitted by a light source in a particular direction, weighted by the luminosity function (a standardized model of the sensitivity of the human eye to different wavelengths, also known as the luminous efficiency function). A common candle emits light with a luminous intensity of roughly one candela. If emission in some directions is blocked by an opaque barrier, the emission would still be approximately one candela in the directions that are not obscured. The word candela means candle in Latin, as well as in many modern languages."
See TriLux meter.
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