When shopping to replace and upgrade your current lighting solutions, you may note that bulbs come in a variety of shapes, sizes, light intensities (lumens), and colour temperatures. All of these features must be considered in order to source a bulb that is suited to your needs. In the case of the B22 bulb, the B stands for bayonet (this is the classic push and twist style of bulb cap) and the number denotes the diameter of the light fitting.

This means that where your light fittings require a push and twist style bayonet cap, you must ensure that you pay attention to the diameter of the fitting (in millimetres) in order to purchase the correct sized bulb.