window treatments

I want to start a new grow using window light, anybody have any tools to help me out with this? I am located in northeastern part of the U.S. My apartment gets great lighting, but I am worried about not enough light at night. Can I mix less with the natural light throughout the day?

So I live in Massachusetts, where weed is now legal, and would like to try my hand at growing this spring. (Just casually, nothing fancy.) We have an old house with a solarium (sort of an attached indoor greenhouse) that we never use. It gets plenty of light, has lots of space, and is well...