Earthed lights are modern lights, also known as Class 1 lights. These lights are suitable for all modern housing with earth wiring, from the 1960’s onward when earth wiring started to be put into all houses for safety. If you have a house built after the 1960s then this is going to be the type of lighting you will need in all of your fittings as it has an earth wire. Earth wiring started to be put in as a standard to ground the electricity and prevent shocks, the earth wiring sends any excess electricity through the ground so you don’t get hurt.