APPLIANCES AND EQUIPMENT

Compact Fluorescent Lamps (CFL)

Advantages of Compact Fluorescent Lamp (CFL)

A compact fluorescent lamp (CFL), also known as a compact fluorescent light, is a type of fluorescent lamp. The best of compact fluorescent lamp is combining the energy efficiency of fluorescent lighting with the convenience and popularity of incandescent fixtures. CFL can replace incandescents that are roughly 3–4 times their wattage, saving up to 75% energy. CFL have long rated life for around 8,000 service hours, while incandescent light bulbs typically last only 500 to 2,000 hours.

Table below compares the wattage of commonly available incandescent lamps and the wattage of CFLs that will provide similar light levels.

Equivalent light output
Compact fluorescent	Incandescent
8-10 W	40 W
11-15 W	60 W
18-20 W	75 W
20-25 W	100 W

How do They Work

CFLs work much like standard fluorescent lamps. They consist of two parts: a gas-filled tube, and an electronic ballast. The gas in the tube glows with ultraviolet light when electricity from the ballast flows through it. This in turn excites a white phosphor coating on the inside of the tube to emit visible light throughout the surface of the tube.

Types of Compact Fluorescent Lamps

CFLs are available in a variety of styles or shapes. Some have two, four, or six tubes. Others have circular or spiral-shaped tubes. The size or total surface area of the tube(s), being one of the factors, determines how much light it produces.

In Hong Kong, there is an Energy Efficiency Labelling Scheme for CFL.