Encyclopedia & FAQ's

DIY Frequently Asked Questions / Compact Fluorescent Bulbs


  • CFL Bulb DIY Frequently Asked Questions / Compact Fluorescent Bulbs')"> Compact fluorescent bulbs offer different style and performance from standard fluorescent bulbs. Their color nearly equals that of Soft White incandescents, and they offer superior energy efficiency and long life.
  • Can be as small as 4.5″ long, and some are the same size as their incandescent counterparts. Not all fixtures designed for incandescents may have enough room inside the shade or glass for the bulb.
  • Cannot be dimmed. Their life will be maximized if they are used in locations where a light stays on for hours at a time.
  • Reflector-shaped compact fluorescents can replace standard R30 and R40 shaped incandescent reflector bulbs.
  • Globe-shaped compact fluorescents can replace standard G25 bath and vanity globes or G30 decorative globes that are used in pendants.
  • Decorator or flame-shaped bulbs can replace similar incandescent bulbs in chandeliers, sconces and outdoor fixtures.
  • Stick-shaped compact fluorescents can replace standard Type “A” bulbs in portable lamps.
  • Twist-shaped compact fluorescents can replace standard Type “A” bulbs in virtually any application.
  • When choosing a compact fluorescent bulb to replace an incandescent bulb, compare the lumen output of the two bulbs. For maximum energy efficiency, select a bulb with the highest lumens and lowest wattage combination. For example, replace a 100-watt incandescent household lamp that produces 1600 lumens with a 25-watt compact fluorescent lamp that also produces 1600 lumens.