I grow in the northeast also, windowsill culture. I go by the color of the leaves to determine proper light - dark leaves not enough, faded leaves too much, etc. While winter seems more gloomy, there are times that the sun angle will hit a point for several days where all my orchids will get burnt leaves. A time to be on guard.
A great help is summering outside. All seem to enjoy a greater amount of light during that time and outside can provide it (like indoor growing, need to watch how much light they get). This seems to help them through our winters.
Keep doing what you are doing, observe how they are, and adjust accordingly. Everyone's home is different. And not all orchids will like your home. Its all a work in progress!
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