BrightArk 18W PLL 2G11 4-Pin Replacement UV Bulb Lamp, Pond Filter Bulbs, UVC Ultra Violet Bulbs for Filters & Clarifiers, Fish Ponds and Tanks Disinfection, 2-Pack

2G11 UVC Germicidal Lamp: This is a compact UVC ultraviolet disinfection bulb featuring a 2G11 4-pin base, 18 watt PLL replacement bulb, and built-in 220–240V anti-interference capacitor for more stable UVC light output. Dimensions: 221 mm × 43.5 mm. Powerful Functionality: The 18W 2G11 UV bulb offers purification, disinfection, and filtration capabilities, effectively inhibiting and eliminating algae growth and bacterial proliferation. We utilise high-purity quartz glass tubing, achieving a 90% transmittance rate for 253.7 nm ultraviolet light. Wide Applications: The 2G11 18W UVC compact disinfection lamp is widely employed for purification, disinfection, and sterilisation in domestic settings, hospitals, swimming pools, aquariums, aquaculture facilities, park ponds, fish farms, fish tanks, and small garden ornamental rockery pools. Installation Instructions: The 2G11 uv disinfection lamp requires simple insertion into a compatible 4-pin filter for immediate operation (please verify your fixture specifications match the disinfection bulb prior to purchase). Caution: 18W 2G11 UVC light possesses strong DNA penetration capability. Direct exposure to humans, animals, and plants is strictly prohibited when using this product. Never look directly at the light source. Note: This 2G11 UV lamp can only be lit using an electronic ballast; inductive ballasts are not applicable.