Just a bit of a grumble, and in most cases, a bit too much headlight is better than not enough, but can people run a cheap LED blinker as a low beam as well their Nightsun aircarft landing light high beams when on shared pathways, please?!
On road, you only need to be seen from a distance of 300m and street lighting gives a decent view of most roads. A $6 blinker will work fine as a low beam, using your eye surgery lasers is then only necessary when it's really dark and nobody's about - country roads or night time MTB come to mind, even then some sort of low beam is a good idea.
I was walking along St Kilda Beach shared path last night and I've still got blue flares in the middle of my vision this morning from all the SETI project optical signalling gear on people's handlebars.
Rant over, time to visit my opthalmologist.