The krypton bulb is an improvement on the ordinary light bulb. Most modern bulbs contains argon and nitrogen. This gas pressure pushes some of the tungsten atoms back to the filament. This lengthens the life of the light bulb.
In krypton bulbs the argon is replaced with krypton gas. The krypton atom is more massive than argon, and thus does a bether job. Krypton also has a higher thermal resistance than argon. This means the filament gets hotter and the bulb a litle more effective.

Since krypton is a rare gas in the atmosphere, it is expensive, and this 'pushes' up the price of the bulbs.

Krypton lamps are very popular in flashlights due to the high brightness of the light.

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