Calculate your potential savings: Step 1: Count the number of bulbs you want to replace by wattage. We have a printable form you can use to gather this information. Download the form here. Note any special considerations like dimmer switches or motion detectors in place. Step 2: Enter the information about the number of bulbs in the form below. Number of 40 Watt Bulbs Number of 60 Watt Bulbs Number of 75 Watt Bulbs Number of 100 Watt Bulbs