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.