Comparative Study of the Photometric Characteristics and the Efficiency of a Linear LED Luminaire with Prismatic and Opaque Diffusers

Comparative study of the photometric characteristics and efficiency of an indoor application linear LED luminaire with three variants of the optical system without secondary optic, with prismatic diffuser and with opaque diffuser, is done in this paper. The results for the measured with a goniophotometer system located in a dark room laboratory, specially created for such types of measurements, maximum luminous intensity, beam angle, total luminous flux, efficiency luminaire, luminance at vertical angular zones and light distribution for the three variants of the linear LED luminaire are presented. The efficiency losses in the secondary optical system with both diffusers of the tested linear LED luminaire are shown. Comparative lighting calculations of the linear LED luminaire with and without a secondary optical system in an office room are done. Conclusions and recommendations regarding the realized photometric indicators, glare and achieved indoor lighting energy efficiency of the linear LED luminaire secondary optical system with both diffusers are done.