A Store Replaced 65 of Its 150-Watt Incandescent Light Bulbs

Short Answer

A store replaced 65 of its 150-watt incandescent light bulbs with new 45-watt compact fluorescent light bulbs. The light output is the same; the difference in wattage is the difference in heat output by the bulbs. If 1 watt is equal to 3.41 Btu for each hour the light is on, how much less heat must be removed by the air conditioner each hour because of changing the light bulbs?