A quick note on maximizing the performance of your new 3 way fluorescent bulb: The very first time that you turn the bulb on, immediately turn it to the highest wattage setting and allow the bulb to remain lit at that setting for about one hour. The compounds that are added inside the bulb are what actually creates the light output. The atoms within the compounds are excited by the electrical charge. Allowing the bulbs to start with a full voltage before reducing them to one of the lower wattages is like allowing your thoroughbred horse to warm up before it performs on the track. It will help to maximize its performance.