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Xenon and Krypton

What are these two elements used for? My specification says I need to know that they are used for 'specialist lights', but I can't find anything about this in the text book.
Thanks :smile:
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Stranded
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Uses

Krypton and Xenon are valued for their light emitting properties when electrically charged. Krypton and Xenon are also valued for their total inertness coupled with high molecular weight (83.80 and 131.30, respectively). Krypton and Xenon are about two to three times as heavy as argon (molecular weight 39.95) and approximately three to four times as heavy as nitrogen (molecular weight 28.0) which is used as in inert gas in many applications, but is not a true inert gas. These properties are put to good use in multi-pane windows to reduce heat loss due to convection between the panes; and in light bulbs, where their high molecular weight slows evaporation of the hot tungsten filament, leading to longer useful operating life. Krypton and Xenon have also been considered for a more exotic application - as the propulsion gas for deep space exploration using ion engines.

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