All bulbs were physically intact and working on delivery, but statistically some just won't last, bulbs will fail along the tub curve, and only first-class manufacturers are eager to detect failures at an early stage. I turned on all 25, it took about 10 seconds for the first bulb to go out, then another about 30 seconds for the next. . A few other bulbs suffered from another pseudo-failure mode where the bimetal was delayed at the breaking point, resulting in a non-flashing half-light condition. However, they could be saved by gently tapping the bulbs until they were stable like the others. Overall, 23 out of 25 bulbs worked, which is acceptable for cheap Christmas lights. From an absolute point of view these lamps are still 2 times more expensive than they should be, you can find them cheaper but they arrive quickly so I guess you have to pay for them. Convenience.
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