Out of the box they seem pretty good so far. The color temperature is right, my camera recognizes 4000k, which is what I ordered. This is done using my smartphone's camera, which is capable of detecting flickering/banding. - CRI is ok, I have no way of verifying the claim of 80+ but I have no doubts about it, colors seem decent although I think it's closer to 80 than 90 CRI - 600 lumens of brightness are probably too high. In fact, if we compare it to well-known brand lights, it's probably closer to 400 lumens. I didn't see any Comzler branding on the packaging or on the bulbs themselves. There are also FCC and CE labels on the packaging (not on the bulbs), but I highly doubt they were actually certified. If any of these lights go out, I'll update my review of the hours per day at my home office. After about 20-21 months, 2 light bulbs failed. My initial rating was 4 stars but I'm deducting 1 star for the relatively short lifespan as it doesn't even come close to the 30,000 hours they advertise.
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