I use a C&B Seen (1000lm) on the centre of the bars along with Knog Frogs flashing further out and a Joystick with a Beacon diffuser thing on my helmet. Also a red eye mini in the back of the Joystick and a flashing Cateye rear light on the frame. It seems a lot but I don’t want broken ribs again!
A couple of years ago I got knocked off by a car turning across the front of me and after speaking to the driver I realised that he was looking for something car-shaped which is why he didn’t see me, despite all the lights, so I use the Knogs to give me more a more recognisable or obvious ‘shape’.
Don’t forget about reflective stuff too – I use tape on my frame and the 3M things clipped on my spokes.