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I wouldn't be able to stand being in a room with 5000K lights for more than a few minutes. I like 3000K-3500K "halogen" color range; everything higher looks cold and blue to me.
The lights I noticed dropping in intensity were big-box PAR30 long neck replacements. They advertised output rivaling my old halogens, and they delivered it -- for about a month. Now they are putting out far less. They still work, naturally, but I almost wish they'd quit. As to usage, they're in a dark kitchen and are on probably 12 hours/day.
I've resigned myself to paying a premium for Soraa bulbs. So far I'm pleased. They've tended to start out brighter than advertised and then settle into a lower, but still sufficiently high, output. Plus I can pick from a range of color temps and CRI levels.
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