You jest, but a 300 lumen Cygolite pointed rearward wouldn't be a bad idea in some circumstances. If I am riding directly into the setting sun and cars coming up behind me are going to be blinded by the sun, I take one of my 650 lumen NRs and snap it onto the seatpost in flash mode. I would of course prefer to not ride in that circumstance, but occasionally I have to and with the NR on flash the approaching cars steer clear, even with the sun in their eyes. As soon as the sun is no longer an issue, I put it back on the handlebar with its partners.