At Budgetlight, we have a diverse assortment of CFL bulbs with many different sockets. Apart from the commonly used E14, E27 and 2-pins socket, we at Budgetlight also offer the 4-pins CFL bulb. 4-pins energy saving light bulbs always have a 4-pins socket and work with a electronic ballast. This means that they don’t need a starter to work. When purchasing a 4-pin, it is convenient to pay close attention to the wattage of the bulb. Each wattage has its own socket, which means that changing wattage is not possible.