There is plenty of information available to help you or others with that decision if you were in the market for a light to see with. I started this thread with the hopes of eliciting information about being "seen" in daylight.

The majority of my riding is on single lane rural roads in bright daylight, I wave/raise a hand to drivers of oncoming vehicles (it's a regional thing), and notice that some drivers are not aware of my presence until I show a sign of greeting, and some don't ever make eye contact. It's the unaware daytime driver I want to target, and target them from a long distance, before they reach for a button, cell phone, or turn to talk to a passenger, or plan to early apex a corner.