Now that I’ve started riding again, I don’t want to stop when it’s dark after work, which of course means riding at night. I have a Bontrager Ion RT Pro that I was planning on using on my helmet and was thinking about something like a NiteRider Lumina Dual 1800n for the bars. Not enough? Too much? Suggestions?

The three trails I usually ride at are Beatty, Ballantyne and Purser-Hulsey. I thought that Beatty closed the gates at night but saw another post saying they are having Wednesday night rides. How about Ballantyne and Purser-Hulsey?

Obviously, I have no idea what I’m getting myself into but any help is appreciated.

You've got plenty enough light.  Back in the day we used to ride with 2 halogen trail rats that were maybe 300 lumens each.
For me right rides are a totally different mindset.  Forget about your times or average speed and such and just enjoy the ride.  They are much more fun as a group because the more lights the more fun and there can be a sort of "were in it together" vibe instead of just going fast.
 
As I understand Beatty has given the OK for the one night a week organized ride only. I'm on your side of town too and I'll probably join that Beatty ride a few times to support it but my schedule is more "after work" such as a 5:15 to 6:30 ride time.  7:00 start times are too late for me as I could get a ride in and be home by that time 7:00.  I'm looking at Purser and RRT on that schedule.   I suppose I need to check out Ballentine sometime if its going to OK night rides but 485 traffic has gotten more silly with that construction happening.