"As needed" is going to be all day, every day for plants grown indoors in winter, Pamela. You're really underestimating how much light these plants need, I think. If you start moving them around and giving them a couple of hours here and there they will not be happy.

Tropical plants, even the ones that take some shade outdoors, get very bright light and have long days - even in winter our daylight down here in Florida are lasts a couple of hours longer than further north.

I should be saying I'll move plants if needed the other such as my dragon tree can take that direct light all day but I don't think my devils ivy needs that much ? Correct? And the Cassandra and pinta would need the cfl light for 8 to 12 hours a day ?? What about the newly potted Persian shields? I grew them in full sun and very warm shade they loved it! I don't really know .. how do you estimate the time each needs in the sun ? I have searched this question so many times and I guess there is nothing but per plant. But I don't know all of them so it's harder to figure out starting with what they like outside.. I can't wait to figure these things out. Lol I love talking to you all here but I hate asking same things over and over and frustrating others. Lol