Cement, Energy and Environment

and negligible loss of power in terms of heat genera on. Hence LED for ligh ng purpose is a good alterna ve of commonly used light sources. Moreover research is going on to develop more efficient LEDs. It is true that the ini al cost of LEDs is high but its life span is extremely high compared to other light sources. So LEDs can be good alterna ve to replace the exis ng less efficient ligh ng source in all sectors of applica on. It is fact that the ini al investment and payback period of the proposed ligh ng system is high. But the savings in long term is of very high significance. Minimum life span of a LED is 50000 hours whereas the life span of fluorescent light is around 10000 hours. Taking 10 hours of opera on Fluorescent light fixture will last for 2 years and 7 months. For the same hours of opera on per day, LED light fixture will last around 13 years. So the one me investment in LED light is bound for around 13 years whereas the investment of fluorescent light fi ng is bound only for around 2 years 7 months. Hence for the period of 13 years the exis ng fi ngs would need replacement four mes. Saving of energy consump on in illumina on:- Below is the chart showing the saving of energy consump on in illumina on. The chart shows the KWH consump on per year before and a er installing LED lights. 89