Never found a head torch I rated for seeing by at bicycle speed, it'll also be shining right in the eyes of the people driving a ton and a half of metal towards you - dazzling those that can inadvertently kill you is never a good idea.
Budget? £20..50....100...++
If this is a regular thing and will continue to be for a good while then I would seriously consider getting a dynamo hub wheel built & appropriate permanently fixed light. More thief proof, never run out of battery power, lights invariably designed and built to throw light onto the road for just what you need.
How fast do you ride? - faster = needs brighter light further up the road so the brightness of the light comes into play.
If not dynamo, Are you looking for AA type battery power (dead easy spares but usually not super bright) or USB chargeable (often better power / brightness & useful if you're office worker for daytime top like a phone) or would non standard rechargeable battery types be ok? Usually bigger rechargeable battery packs with specific charger. Better power and very bright but fast discharge and if they die mid ride not as easy to carry spares.
At +/- 12 mph on my foldy bikes I can use my Cateye volt 300 (lumen) to see by in pitch dark countryside roads & trails. Much faster than this and I prefer either my Smart 700 (lumen) or my magicshine T6 clone (1000+ lumen) this OTT for road use really and bulky battery pack to consider) but it'll sure light your way - if you do go for this type, please replace the plain glass with a fresnel glass (£5 or so from amazon etc) to make the spread of light better for you to see by and not blind oncomming traffic.
Two lights are better than one, one flashy for others benefit and one steady for yours. This goes for the rear too. Steady lights allow drivers to gauge your distance better than flashy (apparently) as they approach and pass you.
, cable held in place along top tube by some reflective wrist slaps.
