[Fit Models]: T8 10W replacement bulbs for 20W electric bug zappers. No. 97341-CHN-1 Please measure and confirm the bulb size of zapper before purchasing [365Nm Wavelength]: Emits 365nm ultraviolet light, which is highly attractive to mosquitoes and other flying insects This wavelength falls within the UV-A spectrum [Long Lasting]: Long-lasting UV bulbs with over 3000 hours of life For optimal performance, replace every 3-4 months with continuous use [Bulb Size]: Package includes 10 bug zapper bulbs Bulb dimensions: 13L x 1W x 1H inches Total length including pins: 13.5 inches 10W power rating Color: As shown Material: Glass Package Contents: 10 x Bug Zapper Light Bulbs (variations in printed labeling may occur) Note: Light reflection and display differences may cause slight color variations between image and actual item. Measurement tolerance: 1-3 cm.