Lights bulbs come in various shapes and sizes, which can quite often confuse people, so we are going to keep it simple.
The 10 stands for the distance between the pins measured in millimeters from centre to centre. Most commonly used in spot lights/down lights and are installed in a push and twist fashion. Most GU10s operate at 230V in the UK.
MR16 describes the bulb itself, not the fitting. MR stands for Multifaceted Reflector and the 16 is the diameter of the bulb in an eigtht of an inch. So 16 eighths equals 2 inches (16/8=2). GU5.3 describes the cap size – 5.3mm width measure from the pin centre to centre and the diameter of each pin is usually between 1.47mm and 1.65mm. GU5.3s are used in Spotlights and normally operate at 12V.
Similar to the the MR16, the MR11 name describes the bulb in the same way. The bulb diameter is measured at 1.375 inches. The pins look very similar too, however, as the GU4 name highlights, the distance between the pins are 4mm and compared to the MR16, the pins have a smaller diameter too (0.95mm to 1.05mm). MR11 normally operate at 12V.
As with the GU10, the pin shape are the same, however the distance between the pins is 53mm. These bulbs are popular due to the slim profile and are most commonly used under kitchen cabinets. GX53s usually are operated at 230v in the UK.
There are several sizes of Edison Screw. The two most common ones in the UK are the E27 (above left), also known as Medium Edison Screw (ES), and occasionally Large Edison Screw, and the E14 (Above right) also known as the Small Edison Screw (SES). Similar to the GU/GX Series, the number describes the diameter of the pin, or in this case “thread”. An E27 has a 27mm thread and an E14 has a 14mm thread. There are several other types, however these two are the most common. E27 and E14 bulbs operate at 230V.
Bayonet Caps are named in the same way as Edison screws. The B22 (above left), also known as the B22d and BC, has diameter of 22mm from the tip of each side pin, whereas the B15 (above right), also known as B15d and SBC, has a diameter of 15mm. Once again, there are several types of Bayonet Cap, but these are the most common in the UK. They operate at 230V.
There several more types not covered as of yet, however these are the types that are most common and the majority of bulbs follow the same pattern. If you are unsure of what type bulb you have, feel free to contact us HERE and we will be able to assist you.
Please Note: All Voltages are based on the specification of our products. ALWAYS check the voltage of the bulb before purchasing for your own safety!