![]() Secondly, as the halogen bulb is used, tungsten atoms begin to evaporate from the filament due to the extreme heat. It is a very simple technology fundamentally, but there are flaws in the halogen mostly relating to efficiency of power.įirst of all, halogen bulbs produce more heat than they do actual light (incandescence), which translates to an inefficient usage of potential energy. Fog lights operate at around 35 watts to 55 watts, and high beams at 55 watts to 85 watts. Halogen low beams will normally operate on 55 watts of power. This is essentially the same principle of operation as fire: intense heat used to produce light. It is this high resistance that produces heat and ultimately light as a byproduct. When electrical current is supplied to the positive lead wire in the halogen bulb, it crosses a path of tungsten wire, which has very high electrical resistance. ![]() The bulb itself is also filled with a noble gas of some sort, which we'll get into later. ![]() On some bulbs, like the 9006/HB4, the glass bulb that encases them is capped at the end with a nickel-plated brass film. The filament is held up by two chemically-treated, copper-coated steel (or molybdenum) lead wires. The bulb itself houses a filament commonly made of tungsten metal, which is basically a very delicate loose coil of exotic wire. Halogen lighting involves a conventional direct-current direct-circuit setup. Halogen is what has been used in automotive lighting for the last 50 years or so and has peaked in its technological advancement. ![]() Before there was HID technology, there was halogen lighting. First a background of automotive lighting technology. ![]()
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