Fluxient lights from amazon.co.uk is my recommendation. Reviews on TorchyTheBatteryBoy.com. The cheap DX lights / torches are good, but the batteries let them down massively. By the time you start replacing them with decent batteries, you may as we’ll have gone with something decent from the start. And that’s before we even start worrying about chargers that catch fire etc. And the fettling to get a reliable set up, that doesn’t leave you in the dark at the worst possible moment. Save yourself the hassle and get out in the bike instead.
Torch on your helmet, no cables – Fluxient U2 mini, £40
(with an Exposure Joystick mount, available separately from CRC)
Bar mount light on you bars – Fluxient XM-L2, £70
That’s all you need. More light would only be required for an arms race.