Packing: 6 pieces 6 watt fluorescent bulb,Compatible with Dynatrap DT2000XL,DT3012. Size: 9 inch Full Length including pin ,G5 Base. Please confirm bulb size before ordering. Tips: 5000Hours lifetime. For best performance,suggest replace lamps every 5000Hours (about 5-6 months). Professional: black light bulb with 365-368nm peak wavelength.