Ya lo, after that need to top up gas. 

Bro, no such thing la, plasma brightness will begin to dim over a period of time after repeated usage average six hours a day of television equate to 14 years before the plasma's brightness begins to fade to one half of the original level of brightness This process is a slow and gradual one with ranges from 20,000 to 30,000 hours along with the manufacturer estimation of 60,000hrs.