I recently encountered an MQTT Bridge project on GitHub that bridges from ST to MQTT. OH has good support for MQTT so that could be one way.
Just to expand on this a little bit. If you don’t care about color, you will probably want to use a smart outlet or switch rather than a bulb. The problem with bulbs is if someone physically flips the switch the bulb is completely offline. That can often be a usability problem and often runs counter to your @Qliver’s statement “existing wall switches to work as they did before” . I personally have no smart bulbs for this very reason.
EDIT:
Just one anecdote about ST from another thread. This is a common refrain for people coming from ST. They leave the platform because it is limiting and not very stable. I’ve not seen the same complaints about Vera so if you go with a hub that might be the one to choose.