Lights for aero seatposts

Until yesterday I used an old heavy chromed Russian track frame with Miche Pistard wheels as an everyday bike.
I grabbed brakeless carbon yesterday and don't want anything else. It was a bliss. And comfy as hell.

So let me enjoy my middle life crisis and advice on the lights, please!

What do you use on your aero bladed seatposts and frames? Be is a track bike, TT, triathlon etc.

fair enough.... sorry for being a bikenazi.

why not just put a knog on the driveside seatstay.