The best replacement for krypton is xenon.

The best alternatives to krypton are rated as following:
★★★★★  xenon
★★★★  argon
★★★  argon windows
★★  radon
★★  kryptonite
★★  xenon bulb
★  xenon bulbs
★  vulcan
★  arctic
★  arctic laser
★  asgard
★  xenon maglite
★  argon gas
★  led maglite
  gallifrey
  xenon brighter
  helium
  full tilt
  planet vegeta
  neon

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Google Trends

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krypton
xenon
argon