The crowd were met with a parade of carnival dancers - all still smiling despite temperatures as low as 7C.
On top of this, a number of local shops and restaurants offered visitors a one-off 20 per cent discount for the occasion.
One onlooker said: "There are some absolutely stunning colours and carnival vibes on Carnival Street right now...It was a truly magical and beautiful evening."
The lights will remain on Carnaby Street into January, giving visitors plenty of time to see them in person.