I've tried this, with one of the decathlon micro-lights mounted on the handlebars.
I thought, given that I am the largest item on my bike, and I'm generally wearing neon yellow, it's a smae not to make use of that at night.
It seemed to work well as a concept, and I'm sure it increased my viability from the front and to a certain angle on both sides. It was quite hard though to not get the light in my eyes when I looked down, and as I was trying it with the light from my helmet, I didn't get much further.
I'll be interested to seehow you feel it works if you try it?
Cheers
Steve