Abstract
Light-emitting diode (LED) based luminaires have brought a drastic change in the lighting world by conquering and replacing the earlier used incandescent and fluorescent bulbs. At the present time, they are used almost everywhere from street lights to industries, from household applications to artificial lighting. LED-based luminaire emits direct light and hence needs to be diffused. An ideal diffuser for a luminaire would hide the appearance of the light source behind it and scatter all light within a specified beam distribution with no backscatter or absorption. Another ideal property for such a diffuser would be controllable anisotropic scattering which could be tailored according to the particular needs. This study focuses on the importance of diffusers and lenses in low-wattage white-LED-based DC luminaire. LED-based DC luminaire has been considered for the experiment because the wattage of these luminaires are lesser compared to the AC one and the focus of this experiment is to give preference in the application of the solar photovoltaic system. The experiments performed with different diffusers and lenses show that these cannot be used to improve the efficacy of the system but are important to prevent consumers from the negative effects of white light. The effect of diffusers and lenses on various optical parameters like CCT, CRI, and luminous flux has also been studied.
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Acknowledgements
This research was supported by SPV Lighting Lab, the R&D Laboratory of the National Institute of Solar Energy (NISE). The author thanks NISE for providing all the assistance and instruments for conducting the above work. The support is greatly acknowledged.
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Uppal, S., Chakraborty, S., Haldkar, A.K., Kumar, R. (2022). Are Lenses and Diffuser Important to Use in Low Wattage LED Luminaire?. In: Edwin Geo, V., Aloui, F. (eds) Energy and Exergy for Sustainable and Clean Environment, Volume 1. Green Energy and Technology. Springer, Singapore. https://doi.org/10.1007/978-981-16-8278-0_15
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DOI: https://doi.org/10.1007/978-981-16-8278-0_15
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