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Seeds Under Lights Versus Greenhouse

I am new at starting seeds, and have used lights over the past couple of
winters.  Here in Ontario, January days are short.  I always thought
that leaving the lights on for 16 hours would be preferable to a
greenhouse, making the plants believe we were having longer days than we
really would be during the winter.

But recently I had a conversation with a man who grows plants for the
main street of our town, and he mentioned that a greenhouse is
preferable to lights, and that many plants grow better in a greenhouse
than under lights.  His comment was "impatiens will do ok under lights,
but that's about it".

Does anyone care to comment on this?  If it is true that some plants
respond better to greenhouse conditions, and others to lights, does
anyone have lists of which plants prefer which, and which plants don't
care?

Would really appreciate some direction on this subject.

Thanks in advance,
Heather in Markham, Ontario
Cda Zone 6 / USDA Zone 5
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