Well, all I can say is that the light scene was never in the VHS copy I saw.
I deliberately trawled through it, back then, because I felt sure the one on television had cut many pieces out (had been very intrigued at the egg cocooning). The only difference was that almost insignificant piece, where the lights came on instead of just already being on and that was on television. It was taken out of the video edition of the film.
It was later that I realised the novel had a whole host of things which were never filmed.