Is it possible to fool deciduous plants into keeping their leaves
durin winter by using grow lights to prolong the "day"?

If so, what kind of lights should I use? At the moment I have two
baby plants (about 30-40 mm high) under a single 20W household
fluoresent. Should I get one of those 105 watt Envirolites - they
seem quite inexpensive and cheap to run too (for about 8 hours per day
in winter. (4 hours in the morning and another 4 from late afternoon).