Incandescent
lamp that generates light by passing an
electric current through a thin
filament wire (usually of wolfram) until it is extremely hot.
The lamps are often filled by a halogen gas such as iodine and bromine that allow
filaments to work at higher temperatures and higher efficiencies.
Source:
PAC, 2007, 79, 293
(Glossary of terms used in photochemistry, 3rd edition (IUPAC Recommendations 2006))
on page 440