I thought that, in the UK, there is a max wattage for headlamp bulbs. But, having just looked, I see all sorts of crazy powers available. I live in Ceredigion near the Brecon Beacons, famed for it' dark skys. No wonder I'm getting blinded on the lanes. Not least of the problem is people running those bumper lights that are only meant for daylight fog. I call 'em ego lights.
So I'm not too concerned about my bike light being on the bright side. If the driver dips his lights I push it round the bars slightly.