Authors: Tseya Chou, Dingjing Chou, Lingguei Gao
In recent years, the luminous efficacy of light emitting diodes (LEDs) has met energy conservation requirements. However, in lighting applications, lighting instruments must be appropriately applied to illuminate regions of interest. In this study, the LED AR111 downlight was used as an example to limit beam areas within a preset illuminating range. The TRIZ method was applied to generate ideas for product design concepts. We proposed installing replaceable gratings on LED lighting instruments, three types of multi-reflector cups that can be installed at various angles were designed for use in lighting instruments, and designed multi-reflector cups within gratings based on compound parabolic concentrator principles for calculating various beam angles, thereby improving the distribution of luminous intensity by using secondary optics. The 3D model and optical simulation showed that multi-reflector cups effectively controlled beam angles, satisfied various types of applications for illuminated objects, and enabled the effective utilization of light beams. By manufacturing a lighting instrument and measuring the distribution of luminous intensity, we ascertained that the use of multi-reflector cups in lighting instruments effectively prevented glare. Moreover, replacing the multi-reflector cups for use at different angles enabled the illuminated object to receive favorable lighting. The component was verified to satisfy design requirements.
Keywords: light-emitting diode lighting、multi-reflector cups、 beam angle