A Multi Channel LED Luminaire with Bluethooth Control for Optimal Retail Lighting

Multichannel LED luminaires can generate tunable illumination spectra, which creates new opportunities for designers of professional lighting applications, such as retail and museum. One of such opportunities is to select an optimal illumination spectrum depending on the desired Correlated Color temperature (CCT), the target illuminance and the object to be illuminated (object-oriented approach). A Bluetooth Low Energy (BLE) controlled tunable six-channel LED light source is designed and constructed. A Python code, adopting a genetic algorithm (GA) is developed to compensate for the shifts in the LED spectra due to a variation of the junction temperature. Validation measurements of the optical output of the luminaire confirm the validity of the concept. A smartphone application has been developed to provide the end user the opportunity to select the desired light spectrum in three ways: a predefined setting for a particular familiar object determined based on the outcome of psychophysical experiments, a selection of the desired CCT and color rendering properties of the spectrum or a free choice where the user can modify the intensity of each channel to achieve the desired object appearance.