These bulbs are brighter than the bulbs they replace. The bond between lens and substrate appears to be very strong. Some of my lights are bend mounted with 1/4" neoprene gasket. I was able to tighten them securely with just a few sheet metal and plastic screws. Bases are not cracked. Time and UV will tell how they hold up, but they do are a good start. The reason I gave it 4 stars is that the wires come out of the base plate about 3/8" apart, so I need to enlarge my existing wiring holes. It would be better if the wires came out of one hole come out on the back.
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