I have decided to go with a Supernova E3 head and tail light, a Radbot, and a PBSF. I also have a backup Princetontec headlight and Eos helmet light. It seems to me that dynolights allow me to ride at any time for as long as I want, and that makes them an essential part of my riding. I would like to have a high-powered battery headlight, but it doesn't seem essential.