We stock head torches from two manufacturers, both major producers of climbing equipment. Petzl invented the modern head torch and have been making brilliant and reliable head torches for years: few companies come anywhere close to them for quality. One of the very few manufacturers that can "hold a candle" to Petzl is Black Diamond who have produced some very innovative head torches in recent times.
Manufacturers now give the number of Lumens that each torch emits (this figure is always for the best option possible). Although we reproduce these figures, more useful would be the number of lumens/square metre, though even this figure would only be relevant when the batteries were new. Far more practical is the chart showing decline in beam length over time that accompanies each torch.
It is important to be aware of this when attempting to compare torches from different manufacturers, and also that the performance figures quoted from most manufacturers, including Petzl and Black Diamond, are not that realistic as they are obtained at 20°C – hardly the temperature at which one normally uses a head torch!