Another vote for running bright blinkies at both ends during daylight. Try to be seen by the right-turning driver who glances in his right mirror. I use a helmet mirror and have been leading weekly group rides for many years. It's amazing how much easier it is to see a blinkie in a quick glance in the mirror than it is a bike and rider, no matter what the rider is wearing. About 300 lumens for each lamp seems right.