How is Tungsten Halogen lamp differ from normal Tungsten filament lamp used in absorption spectroscopy?

Question:How is Tungsten Halogen lamp differ from normal Tungsten filament lamp used in absorption spectroscopy?

1.It has a tungsten filament and is filled with inert gas

2.Iodine is added to normal filling gas

3.Iodine is coated on tungsten filament

4.Iodine is added to inert gas


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