Can Energy Star qualified CFLs be used with dimmer switches?
Yes! Always read the packaging of the CFL to be sure of its proper application, but there are a wide variety of ENERGY STAR qualified CFLs that are designed for use in most fixtures in your home or business. Product types include: • Incandescent shape (or A-shaped) and Globes, both are good in fixtures where the bulb is exposed or in fixtures with clamp lamp shades • Reflectors are intended for non-dimmable track lighting and recessed cans, and some weather protected outdoor spot lights • Candle shapes can be used in some porch lights, in wall sconces and in some chandeliers • Spirals, and mini-spirals are getting smaller and smaller in size and can be used in almost any fixture, especially table and floor lamps with harped shades There are a few qualified 3-way and dimming CFL models that can be used for 3-way fixtures or in dimmable recessed cans or track lighting. (Source: EnergySTAR.
The short answer is: yes, certain ENERGY STAR qualified CFLs are made to work on dimmers. Be sure to check the fine print on the back of the packaging for the proper applications to see if there are any restrictions on the product’s use. Dimming an ENERGY STAR qualified CFL that is not designed to work with a dimmer switch can shorten its life significantly. To find a list of dimmable CFLs, visit the ENERGY STAR CFL Advance Search and search on “Dimmable CFL.” Your local hardware store may not stock a wide variety of dimmable CFLs, so if you are looking for a specific wattage or bulb type, you may want to try to purchase it online. The ENERGY STAR Store Locator lists local and online retailers who sell CFLs. The longer answer is: CFL ballasts are designed for a specific input voltage and are not designed to handle changes in input voltage, and imposing them can cause the circuitry to malfunction or not be able to effectively light the lamp or keep the current through the lamp well regu
