I just want to point out that v4 is under promoted. There's no mention of it on the homepage. I've been using v3 for months now, chaffing due to the lack of exactly the features found in v4.
The only thing missing is complete control over the schedule and triggered transitions. Native support for TP-Link bulbs would be nice, but the point of this post is that the existence of v4 isn't obvious. :)
Love the software and some of its UX. I only wish it gave me more control.