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Delay between me hitting the switch and the light commming on. Why?

When I hit the light switch in the front room, the light doesn't come on immediately but a second or two after. The other lights in the flat work OK. Does anybody know any possible reason why is this happening? And is there a danger of electrical fire happening?
Lenka Dienova, March 2008
Also a lv lighting transformer can do this but again perfectly normal

cb, September 2008
Are you using an energy savng bulb? If so, throw it away and use a proper bulb!

Phil, June 2008
One of two things: A relay, a florescent light. If either perfectly normal.

t, March 2008