Have you ever updated your Glo? One of the updates last spring adjusted the lighting so that it goes much lower than when originally released. I recommend you check your firmware and update it (I am using 2.6.1)
I will compare my two later (when I am more awake) but from memory, the Firefly has a bit of shadow (like the Kindle Paperwhite) while the Glo has a more even light all the way across the screen. I think the text on the Glo is a little sharper (with the light on, on both models). The light can be turned off on both devices (the Firefly has an on screen control, not a button).
Perhaps I will post a side by side picture later.
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