Putting on my "driver" hat, I can say with confidence, that even the brightest lights are very often confusing to decipher. When a cyclist is riding towards you, with a car behind (them (often with its own high intensity led/zenons) the bike light gets totally lost in the surrounding "Halo". it makes it harder to figure out how far away the bike is (in relation to its following car). None of this is an excuse, Car drivers just need to understand this and take their time to work out what the lights are....problem is, they just dont.
I'd like to see how "self illumination" works in this particular application (whether it also gets lost in the halo of confusion)
In addition, on a dark unlit (or poorly lit road) a bike light is also sometimes hard to work out, I saw a chap on an MTB with two fronts and a helmet light and I honestly (despite having almost identical set up) was confused as to what he was, I mistook him for a work lamp on the traffic island that he was straddling as his main light seemed too "high up" to be a bike. I was shocked that it took me so long to work out he was a cyclist.
If he was self illuminated I know for sure I wouldn’t have been confused.
On this subject, I wonder if consistency is the key and if all bike lights were legally set to a standard height (like cars) and a standard (not common) colour ,,,maybe a coloured tint, would it make it easier to identify a bike at a glance?