I have recently bought a nice big expensive lamp for the bike and it is powerfull. Now I do not believe the quoted battery life but there are not many rides where I can get in a 6 hour ride at night to see if it is only going to have a 3 hour battery life.
Sunday I did a road ride so put the light on the bike and left it switched on for the ride- The battery does have the quoted life.
On the ride- I noticed a couple of riders with rear lights working- Why did I notice them? Because they had the rear light switched on. Especially when the sun went in on the wooded parts of the ride. Did not see any one else with a front light but I had a couple of friends on the ride. They shot off to enjoy their ride while I stayed back with a new rider and they said that at one point they were at the end of a 1 mile drag across heathland. We were at the start amongst a group of other riders. The only way they knew where we were- was the lamp. They picked out the one idiot with a front lamp on, and it was me.
I know it is a powerful light, but it was on low power, and it was pointed about 20 ft in front of the bike. Then I have realised that on my way to work- I see several riders going in the opposite direction. They all have lights on and it is their light that I spot before I realise that it is a bike. Then this morning in the rain and I spotted a light before I even saw the bike- let alone realise it was a bike.
So any of you out and about on these murky days of winter- might think about putting the lights on the bike- Even though it is brilliant sunshine when you start on the ride.