CIE published a new recommended system for mesopic photometry in 2010 (CIE 191:2010). The new system is based on a combination of photopic and scolopic luminous efficiency functions. These functions are combined in a ratio governed by the adaptation level of the eye. One remaining problem in implementing the mesopic photometry is the missing definition of the visual adaptation field, which will be studied by a CIE technical committee in the near future. Our objective was to build a two-channel spot luminance meter, capable of real-time, simultaneous measurements of scotopic and photopic luminances over the entire mesopic range 0,005 cd/m~2 - 5 cd/m~2. The instrument can serve as a platform for studying the challenges of implementing the visual adaptation field for performing true mesopic measurements.
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