General lighting with photobiomodulation

Abstract

A lighting arrangement for general lighting, comprising a first light sourceadapted to emit a first light substantially only in a first predetermined spectrum in a range from 615 nm to 690 nm, one or more driver circuits adapted to provide a first pulsed driving current to the first light source for producing the first light pulsing with a first peak radiant power in the first predetermined spectrum sufficient to induce a photo-biomodulation response in a human body, and a second light source adapted to emit a second light, the second light source being capable of emitting at least 250 lumens. The pulse characteristics of the first light are such that no visible flicker or stroboscopic effects can be observed by the human eye in the combined light from the first and second light sources during steady-state operation of the lighting arrangement, and the combined light from the first and second light sources has a combined colour point at a distance less than 8 Standard Deviation Color Matching to a black body line in a CIE x,y chromaticity space, and a first radiant power of the first light in the first predetermined spectrum is at least twice a second radiant power of the second light in the second predetermined spectrum during the pulses of the first driving current.