Facilities Management: Lighting Problem. Calculate the answer to the following questions. 1000 watts = 1 Kilowatt Electricity costs $.10 per kilowatt hour. The hotel property has 360 rooms with an annual occupancy of rate of 70%. There are 10 (ten) 70 watt incandescent light bulbs with a life expectancy of 1000 hours in a room. Light bulbs burn in an occupied room for 6 hours per day for an average 30 day month. How many kilowatt hours are required for 30 days FOR EACH occupied room?