[Best Support] If you have any questions after receiving the item, please feel free to get in touch. We will reply to you, return or exchange for you immediately. [Compatibility] This replacement bulb fits T6, T8, and T9 light bulbs. Please measure and confirm the bulb size of the original light before purchasing. [Long Lasting] These 15W light tubes emit 365nm wavelength blue light, providing long-lasting & superior performance for up to 3 months of continuous use. [Easy to Install] Simply remove the cage, remove the old light bulb, and insert the new replacement light bulb into the socket. Note: please turn off the device and wait 2 hours before replacing it. Package includes 4 x Light bulbs. Size: Over length: 7.83", length (excluding pin configuration): 7.55", width: 1.8". [Widely Used] These 15W light bulbs are suitable for both indoor and outdoor, widely used in the bedroom, living room, dining room, patio, garden, courtyard, camping, and more. (Note: Please keep the lightbulb away from MOISTURE!) Light Bulb for Outdoor & Indoor