Is the LIFX + br30 compatible with Smartthings?
Yes it is!
Yes they are. ST has a native DTH that connects to your LIFX cloud account for light control and hence a small time delayed when you control the LIFX lights within the ST mobile. Works nicely with WebCore.
The LIFX native mobile app is very responsive!
The smartthings app doesn’t list any br30 bulb in the supported devices section.
Interesting, this thread seems to indicate that they were able to get them integrated.