Review on Bright Certified Dimmable LED Bulbs with Equivalent Lumens by Brandy Powell

These fixtures are good because they have a pretty narrow beam angle at full power, but the dimming curve is terrible. Below 25% power my GE Z-Wave dimmers will just turn off while the existing Osram bulbs smoothly dim to 5%. Above 25% the curve isn't linear at all, you quickly reach full lumens and then stay pretty flat for the rest of the curve. This isn't surprising with budget LED lights, and if you're going to use them for general lighting, they'll do just fine. If you intend to turn the brightness down to lower power levels, skip those.