It’s not about the quality of the lights @Shoudychen , they play sports at night there including cricket. Obviously night cricket is played with a white or pink ball.
It’s the rules of test cricket. The red ball is harder to see once artificial light takes over. If the light doesn’t get any better after the umpires have deemed it bad enough to stop playing, they can’t go back on.
Edit: the lights were upgraded in 2007.