The Philips TUV 55 watt germicidal lamp fish pond UV bulb is a high quality high output UV lamp for the control of green water in ponds. This linear tube has 2 pin fittings at each end of the lamp and is suitable for many make of UV clarifier such as the TMC Pro Clear UV55, Pro Pond 110, Algae Master 55 watt, Evolution Aqua EVO55 & many others