Well, I tried out three Soraa bulbs (varying only in color: 2700°K [
model 01481], 3000°K [
model 01497], and 4000°K [
model 01513]). These are PAR30 long neck 50° floods, using 12.5W to put out 575, 620, and 645 lumens at 95 CRI.
To begin with, I swapped out an existing Lutron Diva dimmer (DV-600P) with a new Maestro C?L dimmer (MACL-153M-SW). Regarding the colors, the 4000°K (which I had in mind for the kitchen) was too blue for me. I'll be using the 3000° in the kitchen, and 2700° in the living areas.
The bulbs worked quite well, and were able to dim down quite far. They tend to flicker for a little bit at the lowest setting, but eventually settle down to an even, low light. Naturally, on a dim setting you get a much cooler color with the LED than you would with a halogen/incandescent, but that's to be expected. I did have to tune the dimmer low setting a little bit; at the rock bottom setting the lights would continue flickering intermittently. At the tuned setting, they're still quite low (think low low ambient for movie watching). Also, going from off to lowest setting, they take about five seconds to come on. The light quality of the bulbs is excellent, however, with very even illumination across the 50° flood. All in all, I'm very happy. Oh, and no humming at all that I could make out.
On an interesting side note, I tried out the bulb in one of my RadioRA classic circuits, and it was excellent! No flickering, evenly dimmable even to the lowest setting, and with zero humming.
These bulbs are comparatively expensive, but they seem to do very well in the newer C?L dimmers as well as my RadioRA classic system.