I have ordered these lamps on two separate occasions (12 lamps in total) and I really like them. They're completely encased in some sort of plasticized material that makes them durable, moisture resistant, etc. However, in my last batch of six, one bulb blew out. Swapping one bulb for another works, and I can't get a bulb to work in another fixture, so it's a bulb. But since we ordered a total of 12 bulbs last year, a broken bulb is not that bad. Nevertheless, I find the quality and durability of these lamps better than other brands.
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