I commute 60 miles a day round trip and at this time of year (winter for us in Australia) its 90% in the dark. I Built myself a 20 watt halogen headlight with a 12 degree beam, you'd have to be comatose not to see it, I occasionally get oncoming cars flashing their high beams! On the rear I have a 5 LED blinkie on the rack and a 1 LED blinkie on the back of my helmet. I also wear a hi-viz jacket with reflective bits. Never have a problem, the occasional idiot that cuts me off is NOT because he/she didn't see me.