I tried 6 different types of very warm LED filament bulbs of various shapes purchased from Revain. I evaluated at minimum two bulbs of each type. All of the types are decent, though some stand out in various ways.One thing I search for is a smallish LED filament type bulb that produces a slightly pinkish tint compared to an incandescent light bulb dimmed to the same color temperature (i.e. one having a white point lying slightly below the black body locust instead of the more usual slightly above, in the yellow-green range.) Unfortunately none of the ones I've tried so far satisfy my search like I had hoped, though some lack a noticeable yellow tint. (Note that I am talking about an OVERLY yellow tint; all bulbs in this color temperature range tend to look yellowish, but that discussion is outside the scope of this review.)This Grensk S11 bulb has two small straight LED filaments inside a tinted S11 glass bulb (a small spherical bulb with a standard E26 base).My copies draw around 0.85W apiece, coming in slightly below their rated 1W! They stay quite cool, even when lit for hours.These are actually a bit warmer than 2200K, running closer to 1900K. This makes them even more pleasant in my estimation.They run very close to the Planckian Locust (Black Body Locust or Line) such that they don't have any significant unnaturally yellow-green or pink tint that I can detect.I do not possess instrumentation to precisely measure CRI numerically, but these are higher than typical CRI. They have noticeably more deep red than typical similar-CCT bulbs that are in the lower 80 CRI range, and the deep red to white ratio usually predicts a phosphor converted white LED bulb's general CRI reasonably accurately in my experience. So my verdict is that these are likely >90 CRI as claimed.I haven't tried to discern the lumen output, but I have no trouble believing these are close to the claimed 80.I can't even begin to speak to lifespan ratings, as I haven't burned any of this bulb type for more than a few hours so far.I'm not sure what a rating of "thickness" would signify, so I didn't rate it.
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