Why is krypton used in flashlights?

Krypton in Lighting. Perhaps the most common use of krypton is in lighting. Combined with argon and neon, krypton is used to make red-orange florescent lights. These lights are often in places that need to be seen at a long distance, such as airports, because that wavelength of light is easier to see in inclement weather. read more

Non-reactive gases like argon and krypton are great when it comes to getting them to glow. Over time, krypton has been used in the fluorescent lights. They are probably buzzing over your head right now. read more

Krypton gas is used in fancy flashlight bulbs because it allows the filament to run at a higher temperature, and hence more efficiently. Krypton is also used in the fanciest, most energy-efficient double-pane insulated windows. Most such windows are filled with argon because it's a lot cheaper, but krypton is better. read more