https://www.fenix-store.com/product_...roducts_id=358

Pair that with 4 of the AW RCR123A cells and a charger, and you're set. You could also go with the l2d if you want to stick with AA batteries, but it will be heavier and have less light output. With the length of your commute, obviously runtime is not an issue (same with mine) . I currently use a P3D CE (160 lumens) bar mounted with my Cygolite Tridenx alongside, and a P3D Premium 100 (200 lumens) on the helmet. The P3D Q5 I linked to will give you 215 lumens. Amazing how quickly LED technology is progressing. When I bought the P3D CE (I think in June) it was top of the line

FWIW I use the Tenergy 3.0V RCR123A batteries and their chargers sold at www.all-battery.com. The Tenergy batteries are much cheaper than the AW cells. I have 8 of their batteries and only 1 of them has a slight fit issue (a bit wider than the others...doesn't slide freely in the tube). If I put that battery in first, the light will be stuck in constant turbo mode when I screw the tailcap down. That problem is easily solved by unscrewing the tailcap, putting the other battery in first, and re-screwing the tailcap. I've never heard of anybody having a problem with the AW batteries that are sold at www.fenix-store.com, and they're 3.7v instead of 3.0v so that's supposed to be better I guess.