Concerns were raised after new lights were installed at the top of Moss Heights in Cardonald - Glasgow's oldest multi-storey blocks.
But the multicoloured lights glow so brightly they are causing problems for people who live underneath and residents have called for them to be toned down.
Southside Housing Association, who manage the flats, assured residents they would be of similar strength to the previous ones. But Jim and Jaki Buntin, who live nearby, raised concerns.
Jim, 39, who lives in Dormanside Road, in Pollok, said: "We live a distance away and it is causing a problem for us, I can only imagine how the people in the block feel. It is like a disco or a light show."
Jaki, 42, said: "Our dog Dylan can't settle when the lights are on and he is up and down all night."
The residents contacted councillor David McDonald, who also received complaints from people saying the bright beams were distracting as they travel along Paisley Road West.
A Southside Housing Association spokeswoman admitted the lights had been bright but added: "The lights went through a period of testing. They will be more subtle and I would be very surprised if they shine on to homes below."