I use a blackburn Mars, plenty bright enough.
And make sure your wearing something high vis, I was riding behind a guy with goof f+r lights the other day, but felt the need to point out to him he was still hard to spot even to another cyclsit in a blue (altura IIRC) waterproof on a gray morning. Flurescent yellow with plentyu of reflective bands is both easy to spot in isolation, and drivers are used to seeing people wearing it so it actualy registers as a person even in the dim light.
Also those snap on armbands are cheep and easy to add to any clothes.
Magicshine do a rear light and Y-connector cables, uses a lot of red LED’s so should be very visible.