The Kockney Koi Yamitsu 55w T8 UV Replacement Lamp is a high-quality UV steriliser and ioniser designed for use in ponds, water features, and aquariums. This replacement bulb, suitable for Koi ponds and other water systems, provides powerful sterilisation and helps to prevent algae growth. With a power consumption of 55w, this product is efficient and reliable in keeping water clean and clear for a healthy environment for your fish and other aquatic animals. This is brand new unused original Kockney Koi lamp. Bought for our clarifier but the unit got frosted over winter so this bulb is now surplus to requirements. Retails at about £18.