These replacement bulbs are designed for Dynatrap® models DT2000XL, DT2000XLP, and DT3012, using fluorescent UV light to help convert organic matter and TiO2 into CO₂, effectively attracting mosquitoes. They keep your Dynatrap® running efficiently 24/7, and for optimal performance, the bulbs should be replaced every 3,000 hours—about every four months. Each pack includes two 6-watt UV bulbs.