I'm starting my third winter with DiNotte lighting. I started with just a 600L headlight and PBSF tail light. Later I added a 140L taillight. Then I purchased a 400L headlight on sale (omitting the batteries and charger, because I already had them). My final upgrade has been to the 400R taillight.

So, now I'm running 600 lumens from the handlebars, 400 lumens from the helmet, and 400 lumens of taillight. That, plus reflective tape on the bike, and an ANSI Level II vest, makes me very visible. If anyone hits me, I'm going to own their a$$.