I've been pretty pleased with the See.sense lights. They are a small company but their lights have sensors to detect something coming up on you to change their light pattern/intensity and also connect to your phone via bluetooth to send a text message for crash detection. They come with various hardware for mounting and since I'm new to this site I need to post a few more times before I can share any photos! I picked these up because while I liked the Garmin Varia light the output on those was fairly weak (at least at the time).