Dimmable compact fluorescent bulbs work best with standard slide, rotary, and toggle dimmers and may malfunction when used with older dimmers. For proper operation, any dimmable CFL should be allowed to come to full brightness before dimming. No dimmable CFL on the market today will dim lower than 10% of its full brightness. Please contact our knowledgeable sales staff with any questions or concerns or to help select the best dimmable CFL for your new or preexisting lighting system. This bulb will not work with digital dimmers.