Question: how much electricity does leaving a light on use?
Answer: This means after 1,000 hours, it consumes 60 kWh of electricity. At $0.11 per kWh, this comes to $6.60. 43W Halogen: Slightly more efficient than incandescent lights, halogens use about 25 percent less energy to produce the same amount of light. After 1,000 hours in use, one bulb costs about $4.73 to operate.