Low-Carbon Technologies: Improved Lighting

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Improved lighting may take advantage of natural light or increased efficiency lighting to reduce CO2 emissions.  Light pipes, for instance, collect and redirect sunlight to the interior of a building, reducing the energy used for electrical lighting by about 20-25% according to one estimate.  Autonomous responsive dimming glass may shade solar radiation and yet still allow light in, providing light without electricity or temperature increases.  It is estimated that daylight contribution to office lighting for a six story building can help reduce CO2 emissions by 56-62%, for an overall estimated savings of 3 tonnes of CO2.  Solar photovoltaic lighting systems could reduce CO2 emissions in India by about 5.6-13.6 million tonnes annually by 2020, but would require governmental subsidies to achieve this.