Advantages: 2 Marks
Safe mark: 1 Mark
An incandescent bulb is used for light but it also gives too much of heat. This is not desirable. This results in the wastage of electricity. This wastage can be reduced by using fluorescent tube lights in place of the bulbs.
Compact fluorescent lamps (CFLs) also reduce wastage and can be fixed in the ordinary bulb holders.
CFLs are more efficient than filament bulbs in terms of energy consumption. The ISI mark ensures that the appliance is safe for use, reliable and is made up of good quality.