Double Insulated Lights

Double insulated lights are also known as Class 2 lights, this variety of lights do not require an earth wire. They are most notably used in houses built before or during the 60s in which no earth wiring was put in. For safety and peace of mind if you have one of these older properties then this type of lighting is for you.
Double insulated lights feature two layers of insulating material, this covers the live part such as the cables. Therefore, in case of a fault occurring the extra insulation will prevent the fitting from becoming live and thus reduces the risk of an electrical shock.