Halogen lamps, so called because they carry inside a bulb the vapor of a halogen -generally iodine- that increases the resistance of the filament, reach temperatures close to 2,000 ºC. To resist them, the filament of these bulbs is enclosed in a quartz crystal, which should be avoided by touching with the fingers, since the remains of grease and sweat remain adhered to its surface.
The trace of dirt, which is sometimes imperceptible, causes a chemical alteration of the quartz that is known as devitrification and causes the glass, to put it simply, to deteriorate and the filament to melt. To avoid this, many bulbs have a second wrapping film that protects the quartz film.
Why do light bulbs blacken over time?
Why do the bulbs explode when you put them in the microwave?
What is the difference between white and yellow bulbs?
