As an experiment, I wanted to see if instead of having a white (generically speaking) DRL, would it be safer to have a different coloured light facing forwards, hopefully to be seen by Mr/Mrs SMIDSY. (This test ignores the legality of the colours of these lights).
I then thought, what about a series of colours that constantly changed, ie one colour slowly changed into another colour, would it be more likely to be seen rather than just a constant white?
I then 3d printed a light holder which contained 20 bright LEDs. But these LEDs slowly change colours, from red to violet, to green, to blue, etc, on their own, but they all switch colours at their own slightly different rate, so although they start off as red, within a few minutes, you see half a dozen different colours all within one 30mm diameter light. The aim is to see a constantly changing light which may, or may not, attract the attention of other road users.
Not sure if it works, but I've not been stopped yet.
Watching other road users, there are many that display a blue light, truckers, drivers and bikers.