In reply to DancingOnRock:
It sounds like almost any new head touch will be a big improvement over what you have at the moment. I'd say you want something closer to 100 lumens min. for a decent and safe level of light when running off road.
For road and off road running, Ive used a Alpkit Gamma , Alpkit Viper and a Silva Trail Runner 2.
The Gamma (original model) was about 80 lumens I think, ok for road running but struggled to pick out details when off road. Most recent one finally died after several winter of wet weather use, had at least one previous to that which I lost. Most comfortable torch Ive used for running and felt really balanced on the head (strap over top of head and battery pack at the back seem to be ideal for this). Also had red flashing led on rear battery pack, so great for being seen on the road.
The Viper Ive still got and is a good all round torch, at 125 lumens I think brighter than the gamma but struggles at speed on round ground as most of the light seems to be a focused spot. Also feels a bit 'floppy' as all the weight is at the front and it has a hinged design to angle the light down, also a single strap. Better as a general torch than a running one.
The trail runner is brighter still (160 I think), very good spread of light and solidly built. Reasonably comfortable, but the battery pack feels a bit bulky. Battery life of the rechargeable pack seems to be very good. Also the most expensive but not silly money (45 - 50 quid).
If I was buying one today I'd be tempted to go for another Gamma (new ones are 150 lumens) as they are cheap (21 quid), reasonable bright, well balanced on head and build quality is ok.
Post edited at 13:12