I'm into year 5 with my MagicShine 1600 triple head unit. I have a spare battery pack, and I only charge once per week during seasonal use. The battery rides inside a modified water bottle in my downtube cage. The head mounts on a DIY horizontal tube above my front fender. Plenty of light, sort of like the Close Encounters footage above. I like that the MagicShine allows me to choose from main beam, side beams, or all at once. Plus it has a dimmer feature that saves on battery life when you don't need to stun others with the brightness. It's been great.

I remove the battery pack during summer to save weight. I keep the head and switch units mounted year round.

On my helmet, I use a NiteRider 650 or 350. On handlebars with my race bikes, I just use the 650, with the 350 on the helmet. I'll re-introduce the helmet light in a couple of months.