Visitors to the free event have been told to check social media before visiting on Sunday evening.
The organiser, Artichoke, and the Met Police sent tweets on Saturday asking people to come on Sunday instead.
It is the first time the festival of lights, featuring installations from 30 artists, has been held in London.
The illuminated art has been placed in locations around the city including Piccadilly, Mayfair, King's Cross, Trafalgar Square and Westminster.
It will be lit up from 18:30 GMT to 22:30.
Advice on the festival will be tweeted using the hashtag #LumiereLDN.
Installations were temporarily switched off and Kings Cross Station was evacuated due to overcrowding at the Lumiere London Festival on Saturday.