Just a quick update because I know this is a popular topic… This is a pre-announcement from Phillips hue for devices which should be available by the end of 2018, but it looks very exciting:
Update for 2019: They’re here! Now available in both the US and Europe. Phillips hue bridge required. However, while they work well with the Phillips hue bridge and HomeKit , they are not exposed to smartthings through that integration. according to smartthings staff, the smartthings Zigbee 3.0 implementation did not include the green power clusters that these devices require.