It grows on a bright windowsill, but it does have supplementary lighting, in the the form of a 15W reflector CFL. This is primarily to extend the otherwise short day length during Scottish winters. I do have a Heliamphora heterodoxa x ionassi growing on the same windowsill but with no supplementary lighting:
Yes, in the summer I get long strings of U. sandersonii leaves cascading down the pot.Holy Utricularia!![]()
That sandersonii is LOVING your windowsill.