If you dread riding in the dark, that's perhaps a clue that your lighting system is not adequate. There is no excuse not to have a great light system these days. The prices for LED light systems have dropped incredibly over the past few years, concurrent with the marketing of more powerful lights with longer run times. You can buy an 800-lumen headlight now for less than $100, with run times that should get you through any commute distance. Similar improvements have come with taillights.