1st post so forgive me!
I experienced this on Phuket Airways LGW
v.v on I think a 747-200(this was in 04 way before I knew A.net existed) those old birds had what I called the 'disco effect' every slight bump & all the lights would flicker in a pretty patten sometimes starting from the front sometimes from the back. Every light from the F/A call light, the reading light & the general cabins lights would flicker even if they were on or off in a random pattern sometimes the whole cabin would go dark with just the F/A call lights twinkling up & down the cabin in a random but quite eye pleasing sequence then it would be the reading lights & sometimes the cabin lights would start their show.
I'm quite glad they dont fly anymore after my last trip with them BKK
in Sept 04 when we took off in to the mother of all thunder storms. I've never been on a flight where the engines struggled soo much & I had to hold the F/A(trainee's) hand as she sobed while we shook rattled n rolled our way over north Thailand!