Quote Originally Posted by Styx
I once thought the light requirements were a concrete thing, but it seems like there are many factors influencing it.
The amount of light needed by a plant to grow well is kind of a concrete thing. The problem we're having is we don't know how much light is coming through your windows. That's where a light meter would really come in handy. Your west window is different from my west window. Your west window is probably different from your neighbors west window. Every window is different for a whole host of reasons. There are lots and lots of factors that can increase or decrease the amount of light coming through any particular window at a given point in time.