There are international norms which define methods for characterizing indoor luminaries in terms of photopic considerations and visual requirements, but lighting impacts in humans in others ways than those. Light in buildings is part of the environment, the discovery of the ipRGC cells in the human retina, and its associated action spectra, lead to the introduction of initial concepts such as circadian action functions and circadian action factors. An innovative methodology is proposed and evaluated to simulate potential melanopic contribution of the lit environment to the occupants of an indoor space. By performing measurements and efficiency simulations based on real LED luminaries, we are determining which parameters could be calculated in melanopic terms. Our measurements lead us to follow a method to differentiate and complement photopic and melanopic contributions of sources. These melanopic illuminance metrics require irradiance-wavelength-dependent measurements; recalculating polar curves, modifying data files, and spectral reflectance characterization to evaluate the melanopic contribution of the lit environment. We validate a simulation model through a comparison between the experimentally measured lighting values and those provided as output by commercial lighting design software DIALux.

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