This 4 pack came with 1 defective bulb. The metal contactor piece at the bottom of the bulb was missing. I later found the missing piece rolling around in the box and tried to reinsert it into the bulb, but the bulb still did not function. Of course I didn't inspect the bulbs until it came time to use them which put me outside the time frame of returning them. I have emailed their customer support 3 times now over the course of 2 weeks and not received any response from the company. The working bulbs work fine.
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