Lights

Busch and Muller's Topfire helmet lightsare a really neat way to get yourself a bit of extra visibility on the bike. They're easy to fit, effective and weigh next to nothing.

The kit contains four single red LEDs connected to a battery compartment housing a cheap-to-replace 2032 button cell. The LEDs sit in the rear vents of your lid, held in place by double sided sticky tape, and the battery clips to a strap or, in my case, the centre strut of the rear retention system.

A good light is vital for commuting to work and evening training rides and the compact and keenly priced Moon X-Power 500 makes a very good argument for itself. It's plenty bright enough for all but the most demanding riders, and the beam pattern is a well rounded shape.

My commute will shortly be done in increasing darkness, and before long in pitch black. I can justify buying a new set of lights, front and rear, as the more I ride, the less I am spending on petrol.
What I need to know is what is a sensible level of brightness to light up the (unlit, country) roads ahead?
Lumens, candlelight, watts etc all mean nothing to me, so what level should I be looking for, anyone know?