13 PL-S WATT UVC LAMP x 2. For best results from your uv unit, a UVC Lamp Should Be Replaced Every 6-12 Months. This is a standard size 13 watt PL-S UV bulb with two pins at one end and will fit a range of units from many manufacturers inculding,Hozelock, Oase, Fish Mate, SuperFish and many more.
eBay