cost wiseMusicbooks, I have just bought Dave's second recommendation, and it arrived today.
First impressions of it are way better than I had been expecting. The quality is very good, which includes the light unit, the battery, the wiring and connector, and the battery storage case. It's a bit bigger than I had been expecting and the weight is also far more, but somehow that adds to the quality feel. The lighting is also outstanding, and at nearly four times less than my fenix BT20.
I've mounted it to a cycle helmet, but will see how this one goes, simply because of the weight and bulk reason. The main on off switch is also a guide as to when to charge, green being fine, red recharge. The instructions are very specific in relation to this, and the unit must not be operated once the red glow has shown. With the light being helmet mounted, I shan't be able to see this, but being as it is just a secondary light for off road use, this might not be an issue to me.
If I could find fault, which at the price I can't, then I'd say that I had expected it to work as one/two/three/four operating modes/lights. It doesn't and operates as either high or low, and a strobe mode which in reality could be dangerous and un usable.
I'm still giving a current rating of nine out ten though. Rating it ten out ten wouldn't give me a get out.
So thanks for the link Dave.
Ref the dark pathway. It was pointed out to me recently or else I read it on here, that the darker the route, the less light that you need. That observation made sense when you consider how much light is required in twilight and lit up street areas to make any real difference.