Poor moisture protection. Condensation formed inside in both my first and second set, which eventually blew out several lightbulbs. This hasn't been a problem with other 4" round LED packages like this one, so I'm not sure why they are made any differently. I only ordered a third set because there are no other alternatives for this combo case and the price is not super outrageous, even if each set lasts a maximum of 6 months.
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