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 delivery people deliver ordered items like milk, vegetables early in the morning, mostly before sunrise like between 5Am to 6AM. when the visit our home it will cause inconvenience if our pathway is dark. if we connect regular LED bulb and switches it on during night, it solves problem, but delivery person wont use light for more than 10 mins max. so switching on the light only during that time will save lot of power than keeping the light on for whole night. but how much power do we spend for switching on the light for whole night. if it is one LED bulb of 9 watt night 10 to morning 6 - 8 hours total 8X9watt= 72 watts X30 days = 2160 watts =2.16kwh which is 2 units max spending for 2 units is 14 rupees per month at 7rs per unit.  it is waste of energy to switch on the light for whole night. instead it should be On only when someone passes by. to achieve this we need to buy lights with motion sensor which detects any motion near light and switches on the light. how much can we save fr