Landing lights question

Date:         16 Mar 2001 05:56:20 
From:         "Jeff" <jcbowen.nospam@home.com>
Organization: Excite@Home - The Leader in Broadband http://home.com/faster
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I'm not sure if this newsgroup is active or open to public posting but I
have a question.

At what point to landing lights get turned on and why at that point?

I saw airliners approaching Pearson airport the other evening here in
Toronto and they had lights on quite some time prior to landing and I
wondered why so early since they can't serve much purpose until they are
right over the runway.

Thanks in advance for any information on this.

Jeff