Speedlight UV replacement bulbs are 36 watt dual radiant bulbs for the SpeedLight UV Light 24 volt or 120 volt systems. This product looks like two bulbs joined together. With the SpeedLight uv light system you get the twice the uv radiation versus other uv systems. Most are only 18 watts. This bulb looks like two bulbs joined together. Not to be confused with our SpeedLight Jr. Bulb. Uses a magnetic 3″x 3″ base. Make sure you have at least 3″ clearance. Also you will need a 2″ hole for the bulb to pass through. 3 year warranty on power pack. One year on the bulb. Bulb needs to be replaced once a year.