It's not so much that a motorist
sees you, it's more of a problem with do they
comprehend your presence.........
You can be lit up like a birthday cake for an 80 year old codger and they (cager) still won't comprehend your presence. It all has to do with physical size. How many times have you read about a car running into a truck and the motorist saying he 'didn't see the truck'....almost never unless the cager is loaded or smoked up.
Like sidecars. There are very few accidents involving sidecar equipped motorcycles because for one, there aren't a lot of them (I know that) but when you are riding an outfit, your
physical presence is much greater than a 2 wheeler.
I'm in no way saying that more lights don't help, but how much they add to your physical presence is only a guess and no more. (I have never seen a study done on lighting versus accident rates on bikes though I'm reasonably sure there is one. There's been a study done on about everything, especially with government grants!)
The best thing is to ride your bike in a pro-active stance, that is, anticipate what might happen in your particular set of circumstances at any given moment. That's why I refrain from motorcycle accessories that can distract a rider from that pro-active attitude. Accessories like radio's, GPS units, intercoms and the like, draw your attention away from the most important task, riding your bike without becoming a statistic. A fraction of a second of inattentiveness could cost you your life. Accidents and personal injury happen extremely quickly.