LED bulbs are available at most supermarkets, hardware stores, and specialised lighting and electrical shops. Before heading off to the shops, check what sort of bulb you want to exchange. Nearly all of light bulbs are described by a system of series designations. Out there with screw and bayonet bases, which have the designations Exx and Bxx respectively. The xx refers to the base’s diameter in millimetres. These are often used as floodlights and downlights. They are numbered by the scale of the bulb’s diameter in millimetres, R80 for instance. PAR38 is a standard type