I haven't used them long enough to appreciate durability. They're a bit dim, but that's to be expected with a 3-watt bulb. I wish they were a little brighter. I used them in an old kerosene heater that I was renovating. I had 1 lightbulb which I rotated back and forth trying to get it to work but they all worked when I tested them. I made sure they all work after reading other reviews. I will probably replace the three bulb cord I plugged into the heater with a cord with more outlets for a brighter twinkle effect.
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