SYLVANIA self-ballasted medium base Micro-Mini Twist compact fluorescent lamps are energy-saving alternatives to incandescent and halogen lamps delivering higher efficacy and longer life. Due to their reduced T2 tube diameter design, Micro-Mini Twists are the smallest CFL lamps available making them suitable for use in more luminaires. soft white 2700K 60 watt replacement using only 13 watts (emitting 850 lumens of brilliance) medium base pack of 12 CFL bulbs