Evaluation of lighting systems through adaptation of photometric quantities

The human eye presents different visual responses for different luminosity conditions. Thus, it can be defined different regimes of operation of the human visual system, like photopic and scotopic regimes, for high and low luminance levels respectively. All the classic photometry is based on the vision sensibility under the photopic regime. However, in several situations, it is common to face intermediate conditions known as mesopic. So, in order to convert photometric quantities between photopic and mesopic regimes, there is an equation in literature that describes the relationship between photopic and scotopic luminous fluxes as a function of the color correlate temperature. However, there are some evidences that this expression does not apply accurately to all technologies of light sources. Thus, this paper presents laboratory data showing that the equation in question does not apply to all lighting technologies, pointing towards a review of that relationship.