I ride at night as needed, not my idea of fun, but have done some 40+ mile solo night rides, as has been mentioned good lights, reflectors both bike and clothing, hi-viz isn't much use apart from the reflective strips (been knocked off wearing hi-viz shirt), I have spoke reflectors that will be going on shortly (never been knocked off with them on).
I use a cree T-6 with a wide angle lens and a swivel mount, and usually a couple of other lights for the front, some times as flashing lights, or as an emergency get you home (no good on the dark lanes though), usually 2 or three on the back, 2 normally with a spare, plus a little one on the helmet not sure how effective it is but should all the other fail ..... plus a red reflector on the rear mudguard.