Some would say I have overkill and I certainly have had people comment on the brightness of my taillight and the hugeness of my headlight. I ride all year, including the dark and wet winters of Portland, OR.

Rear : Dinotte 120R, red LED, I use in flash-pause mode. Runs on 4 AA rechargeables. The down side for some is it uses a separate battery pouch.

Front : B&M IXON-IQ LED, very bright, two brightness modes. I bought this for seeing on those dark, wet neighborhood streets, and to be seen.