A led head torch is a light source affixed to the head for outdoor activities at night or in dark conditions such as caving, orienteering, hiking, skiing, backpacking, camping, mountaineering or mountain biking. Led head torches may also be used in adventure races, if racing is done during dark periods. Led head torches are often used by workers in underground mining.
led head torch is usually powered by three or four AA or AAA batteries. Systems with heavy batteries (4xAA or more) are usually designed so that the light emitter is positioned near the front of the head, with the battery compartment at the rear of the head. It is sometimes possible to completely disconnect a head torch's battery pack, for storage on a belt or in a pocket.
Lighter head torch systems are strapped to the user's head by a single band; heavier ones utilize an additional band over the top of the user's head. Head torches used incandescent bulbs before power LEDs became available. Incandescent bulbs have the advantage of allowing more tightly focused beams and the use of more power than LEDs, with the disadvantages of high power consumption, fragility, poor beam pattern and inability to operate at lower power levels. Incandescent head torches also have rapidly declining light output once the batteries start to lose voltage.
White, 5mm LEDs were quickly adopted for use in head torches due to their smaller size, lower power consumption and less fragility compared with incandescent bulbs. Power LEDs rated 1 watt or more have displaced incandescent bulbs in many models of head torches. To avoid damage to electronic parts, a heat sink is usually required for head touches that use LEDs that consume more than 1W. To regulate power fed to the LEDs, DC-DC converters are often used in 1W+ lights, sometimes controlled by microprocessors. That allows the LED(s) to provide brightness that is not affected by a drop in battery voltage and allows selectable levels of output.
www.led-emergencylights.com. Our company engaged itself in the development, manufacture, distribution and international trade of a series of LED emergency lights, including twin spot emergency light, potable emergency light, led torch, exit sign light, search light, emergency bulkhead light, etc. We are also a professional rechargeable camping light manufacturer, providing rechargeable lights for caving, orienteering, hiking, skiing, backpacking, camping, mountaineering or mountain biking.
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