I have an RSP rechargeable rear light on the seatpost, which is set to hop from one side to the other, a Moon Gem 1.0 below that which is set to steady, a reflective LED armband around my right ankle and the Lidl helmet came with a useful LED rear light attached.
I also have little flashy red inserts in the bar ends. Reflective panels on clothing are very useful. I drove up behind a rider with a fully reflective backpack cover & reflective strips on his tights, these were very good.
I am more worried about cars pulling out in front of me, than being hit from behind, despite having an XP300 on medium on the bars, and a flashy Gem 1.0 on the helmet.