Inexpensive lights will not be seen enough in daylight. Expensive lights are a waste of money and scarce energy resources in daylight. It does a disservice to the PSA aspect of a topic to observe that it "probably wouldn't have helped. But maybe". If it's that 50/50 I'll save my money and ride more situationally aware. I'm living proof that you can ride decades in heavy, urban traffic and never get hit. Use Hi-Viz in daylight, use as much or as little light as you need TO SEE, at night. Use whatever safety geegaws are necessary to BE LEGAL in your locality, and the rest is up to your defensive riding skills, and maybe, very good luck on rare occasions.