Lesson: Chapter 10 — Power and energy in electrical appliances

10.3. Efficiency and saving energy 1 of 3

Choosing a lamp

The same job can often be done by different appliances. Choosing the one that does it most efficiently saves energy. Table 10.1 compares lamps that give about the same light.

Lamp	Power	Life
Filament bulb	60 W	1200 h
Fluorescent tube	22 W	3000 h
CFL	11 ~ 13 W	8000 h
LED	6 ~ 8 W	50 000 h

LED lamps are the best buy: least power, longest life. Their higher price has limited their use in Sri Lanka.