Energy saving light bulbs are available in multiple sockets. Next to the 4-Pins, E27 and E14 socket, we at Budgetlight also offer the 2-Pins CFL bulb. The CFL bulb is known as an energy-efficient version of the conventional incandescent light bulb. Energy saving bulbs use up to 80% less energy to achieve the same brightness as an incandescent bulb. Are you planning on buying 2-Pins CFL bulbs? Always check the wattage of the light bulb. This matches with the fitting of the bulb. This means that it is not possible to change wattage.