Sylvania Universal Type A/B Led tubes are the most versatile solution for upgrading your linear lighting. These tubes work with or without a ballast, making them ideal for any situation, whether you're replacing a working lamp or rewiring a failed one. With a built-in color select switch, you can choose from four shades of white - 3500K, 4100K, 5000K, and 6500K. Whether you want a warm and cozy light, a vibrant and energizing light, or something in between, simply select the color that best suits your space. For added safety and durability, each tube features a shatter-resistant Pet coating. These tubes are rated to last up to 36,000 hours, providing long-lasting, dependable performance. Not sure if your ballast is working. Universal Type A/B lamps are the perfect solution. Simply replace the lamp like a Type A. If the lamp fails to illuminate or the ballast fails in the future, keep your Type A/B lamp and bypass the ballast. Why switch to Led. Sylvania Led tubes use less energy, contain no mercury, and last longer than fluorescents, helping you save on utility bills and reduce maintenance costs.