Although nadair we have more and more CFLs at home, Tungsten bulbs are still very present. Tungsten is a metal which offers ideal for producing a bulb characteristics. Being provided with a high resistivity, can pass a current in the metal so that it is heated and thereby emit light. So that the metal does not degrade too quickly, the filament is coated with a substance that burns all the oxygen in the glass globe on the first ignition. Yep, the bulb is then "filled" mostly empty. If we do not do this, the filament burn in less than a second. This may sound strange but after a few moments, the temperature of the tungsten filament rise to around 3000 C.
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