A light tube for a cold electrode fluorescent lamp includes a light tube body,
a first electrode and a second electrode disposed in the light tube body and an
activated gas absorber. The light tube body contains inert gas, mercury substance
and a layer of phosphor coating on its inner surface. The second electrode is adapted
for electrically connecting to the an electric terminal for emitting electrons
to excite the mercury substance for conducting the electrons to the first electrode
as an electric loop, wherein the excited mercury substance emits ultra violet rays
causing the phosphor coating to generate visible light. The activated gas absorber
is gas absorber made of zirconium-vanadium-iron alloy which can be activated at
an activation temperature substantially lower than 900 degrees Celsius, preferably
390 degrees Celsius, to provide stronger oxygenic gas absorption ability while
reducing the manufacturing steps and cost.