WaterResistant 1/3/7 LED HeadLamp

Select 1/3/7 LEDs for 150/80/20 hours light with 3xAAA batteries (high capacity Alkaline or NiMH - not included). This is an ultra-cheap headlamp with 3 brightness settings of which the 3 LED setting is the most efficient, but you can drop down to 1 or step up to 7 LEDs. How bright is the torch? That's a tricky question. A rating of X candlepower or lumens should mean the total light output is equivalent to X candles, but does not specify how focussed it is. A rating of X Lux or lumens per square metre means that at the centre of the beam the light you see is equivalent to the light on a square metre surface shed by X candles a metre away, but does not specify how broad the beam is. A rating of X foot candles means that at the centre of the beam the light you see is equivalent to the light on a square foot surface shed by X candles a foot away but does not specify how broad the beam is. A foot candle is about 10 Lux as the light is concentrated on a much smaller area. Really you need to know both the lumens and the lux, or else one of them and the angle of the beam. LED torches tend to have a very narrow beam but it depends on the lens and the number of LEDs - one LED might have a spread of only 20 degrees, a 3 or 7 LED torch usually has the LED aimed fairly parallel so there is not much additional spread, although there will be some spillage spreadout by the lens. Unless electronic chopping circuits are used to change voltage and provide multiple brightness levels, 3 batteries is the best match for white LEDs which run optimally from 3.6 to 4.2 volts!