Writing here on the off chance you or someone you know frequents the place, since at the time I didn't think you'd appreciate a big scowly bloke chasing after you at night on the paths: this is the third or fourth time someone with your rough build and accent(either *very* Morningside, or English with the edges sanded off by some time spent up here) and so I presume you(since nobody else ever complains) has had a pop as you rode past on that stretch of path as I head to the Tesco and you head towards five ways, theatrically waving your arms in front of your face and exclaiming some variation on "nooooo too bright! too bright!" or "you're dazzling turn it ooooofff!", so I'm writing this to express sincere concern for you.
I ride a dutch bike with an integral light mounted just above the wheel, it's a low-beam compliant with German standards, and it's completely washed-out by even the lowest setting on the Halfords handlebar mounted light I got for lower light situations(and which I do not mount otherwise, so it wasn't that). If such a low power low beam low mounted light is dazzling you, I urge you to visit your optician immediately because there might actually be something wrong with your eyes. That's not snark, it genuinely occurred to me a couple of minutes down the path but, as I say, I doubt you'd have appreciated me chasing you down to express the concern in person.
Also perhaps tone down the performance next time, I actually thought you were going to fall off for a moment(okay, that was snark).