I bought a pack of 6 of these 6500K daylight fluorescent tubes. All were short-lived, despite what the packaging said. Some lasted several days. . . and others, a few hours. These lamps had the lowest reliability rating of any product I have ever purchased. China is famous for cheap products. When a consumer has to replace defective goods with truckloads, that's hardly a bargain. What happened to quality control? The "Made in China" label on this product meant mass-produced. Shame!