Must admit i find it great to be out on the trails and Canal paths early in the mornings in the dark, so peaceful and quite, i don't see another person. The lights on my bike though are totally different to the 80s which were probably of the Ever ready "D" Battery or Dynamo type offering very little or to be honest useless lighting, Today’s lights are amazing, with incredible advancements in brightness, battery runtime, rechargeable batteries, mines 1800 Lumens and lights up the trail perfect, the cycle lights in the 80s would have offered nothing in showing Bamber where to cycle, Ever Ready lights never really did more than signal your existence to drivers. The argument about lights on the bike back then is a non starter for me, because, all they offered was a glow and no spot light as such and would have been useless.
A 1980's torch or dynamo would have provided plenty of light for cycling to and from WHF.
However bad torches were in those days, they were still very useful for seeing in the dark! It's what they were created for.
Also, there was a three quarter full moon on 7th August, which would have provided enough detail in his surroundings beyond the reach of the light, and then the torch would have lit up the area in front of the bike to give more detail immediately in front of him.
I think you've got it the wrong way round. Old fashioned low power lights, pre LED's would have lit up the ground in front of the bike, but would have been the faintest of dots 50 yards away, and would barely register. So actually the opposite of what you are thinking.
But no, 1980's lights provided plenty of light for night time cycling. Particularly if you were going out to murder your family, whereas today you might be whizzing through hilly forests at full speed, in which case you would need a brighter set of modern LED lights. safety first and all that.