Low Voltage - Dimmable mr16 halogen bulbs are low voltage DC 12V, do not use 220V with them, otherwise these bulbs will be damaged. Dimmable - mr16 gu5.3 halogen bulbs are dimmable and can use a dimmer to adjust the brightness. Wide Range of Applications - 12V 20W gu5.3 halogen for pathway lighting, landscape lighting, recessed fixtures with gu5.3 base. Easy to Install - The mr16 halogen bulb has a gu5.3 two-pin socket, just insert it into the gu5.3 socket. Good Material - High temperature resistant material makes this 12V mr16 gu5.3 halogen bulb safer and more durable.