A friend gave m a great headlight, a CatEye brand. Nice beam at night, also has flash mode which is good for daytime on trails so other cyclists can see me, much as I appreciate seeing other oncoming riders also using a flashing headlight on trails.
I have done some limited amount of night riding, and found myself wanting a bit more illumination where *I* wanted to look since most bike headlights are pretty much a circular beam, and not a wide across beam, and turning the handlebars to see something left or right is very dangerous for riding since the handlebars should be used for steering while riding, not to aim a light while riding . Also I sort of had to choose the headlight beam angle to either show me the road right in front of the bike and sacrifice some of the view much farther out, or farther ahead but little illumination of the road 10 feet in front of me or less.
I had put a GoPro camera mount onto my bike helmet, to shoot a few videos of some bike rides. Well, there is a fantastic small flashlight I like to use in general, very bright but not big or heavy, so I worked out a way to mount it onto the GoPro mount on my helmet. So with that light on my helmet, I can turn my head to aim the light anywhere I want to look, left-right-up-down. Which is the same natural thing one does with a handheld flashlight anyway. Having both lights , one on the bike and one on my helmet is very good way to see when riding a bike at night.
And.... if ONE went dead, I still have the other as a back-up to get safely home.
This is also the point where I should say I only use lights (plus tail light) that run off AA or AAA batteries, and carry spares on my bike. There are some charge-up night lights that are very impressive that I will never buy, because when those go dead they are dead till you get home and take a few hours to recharge them, instead of popping in a new set.