Usage Tips:[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]: Emits ultraviolet light at a wavelength of 365nm, which is highly attractive to mosquitoes and other flying insects. This wavelength falls within the UV-A spectrum known for effective insect attraction. [Long Lasting]: Long-lasting UV 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 with continuous use. [Bulb Size]: Pack of 10 bug zapper replacement 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. Other products are not included. Note: Lighting and display settings may cause slight color variations between the product image and actual item. Measurement may vary by +/- 1-3cm.