Fit Models: T8 10W replacement bulbs for 20W electric bug zappers. No. 97341-CHN-1; Please measure and confirm the bulb size of your zapper before purchasing. 365nm Wavelength: Utilizes 365nm ultraviolet light, which is highly attractive to insects; This wavelength falls within the UV-A spectrum and is effective in attracting mosquitoes and other flying insects. Long Lasting: Durable UV replacement bulbs with a lifespan of over 3000 hours; For optimal performance, it is recommended to replace the T8 10W UV bulbs every 3 to 4 months under continuous use. Bulb Size: Pack of 10 bug zapper bulbs; Bulb dimensions: 13L x 1W x 1H inches; Total length including pins: 13.5 inches; Wattage: 10W; Color: As shown; Material: Glass. Package Contents: 10 x Bug Zapper Light Bulbs (variations in printed markings may occur). The package includes only the items listed. Note: Lighting conditions and monitor settings may cause slight variations in color appearance. Measurement may vary by +/- 1-3cm.