Department of Earth Sciences has taken a significant initiative to save electricity by installing modern lighting and electronic devices. In all corridors, stairs and toilets, the department has installed LED (Light Emitting Diode) lights (about 70 numbers) of only 26 watts replacing old tube lights of about 58 watts each. These LED lights have about one-and-half time’s greater lumen. Moreover, these LED lights have been installed along with PIR (Passive InfraRed sensor) and LDR (Light Dependent Resistors) sensors. Further each toilet has also been fitted with an exhaust fan along with LDR sensor. The biggest advantage of these sensors is that whenever no movements for more than about 5 minutes, these will switch-off LED lights / exhaust fans. Additionally, we have also installed two all weather LED street lights outside the department of 26 watts (of 2500 lumen) each replacing 400 watts halogen lights. These LED street lights have dust-to-dawn LDR sensors. Further, the department has also installed 1' x 1' in the Committee Room. In the department's porch and in HoD's office 2' x 2' LED panel lights have been installed.
All LED lights are either Philips or Havells make and have 10 years expected life. Since we have installed these LED lights with sensors and therefore we expect that these lights to have much longer life.
Earlier, generally the lights in corridors, stairs and toilets were kept on all the time. A conservative figure suggests that all the expenditure (made towards LED lights and sensors) which we have made towards the above energy saving initiative (LED and sensors) would be fully recovered in less than three years time. Since we hope that these lights will last at least for 12-15 years and therefore after first 3 years, these lights will provide very significant savings towards electricity bills of the Department / Institute.
The energy saving model which has been developed and tested successfully in last one year in the department may also be replicated throughout the Institute. Visitors are welcome to see the efficacy of energy saving initiatives.