Street light power saving
SA Mansoor, Gulshan, Dhaka
This refers to your correspondent's write up on the subject (DS: April 12). Based on the estimated loss of Tk 90,000 for 1,000 streetlight per hour, the annual loss would be Tk 27.6 lakh . Even if this is halved with better supervision and control, and considering not-working lights and power disruption it could well be around Tk 14 lakh per annum.It is possible to practically eliminate this wastage totally by installing electronic timer controlled street lighting hours with UPS back-up for control circuit. This device can be seasonally adjusted according to longer darkness is winter and considerably shorter in summer to achieve maximum power economy. Consider the fact that despite best intentions a person may forget to switch off lights, if at that time the power is off. Losses in these circumstances could be much higher than Tk 90, 000 per hour. By adopting a timer base control with UPS back-up, not only will money be saved but also manpower, which can be usefully re-deployed by the DCC in other much needed areas. The cost of incorporating the change may possibly not exceed Tk 1 crore, so recovery through savings can be achieved within five years. May we request the DCC to carry out a feasibility study of the proposal to analyse the cost-benefit advantage and decide accordingly?
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