i run 600 watts of lamps for them in winter...i have at least a half dozen that could fill the front window by themselves,my split leaf philodendron is over 7 feet wide at this point,the creeping charlie is up on a bar stool on a 2 foot high shelf and it still trails to the floor...the angel wing begonia is over 6 feet tall and popping new stems once a month....by the time they all come inside i expect i will be hanging lamps in the dining room as well...and building lots of shelves....