laurieny--I received the beta 167 brightness-dimness dev-build. First impressions: Oh laurieny, this is really good! This is the deluxe version, much better than what I would have been happy with! The light scale has been totally reworked so that it touch responds to the keyboard buttons to the new scale. There are not one, but two settings that go dimmer [than what they had been able to before in prior software updates]. When it's pitch dark, the lowest setting seems best to me for surfing and e-book reading. There's no 'stab' to the eyes anymore. Nice, mellow, peaceful light comes out (time to turn on some mood music). Several hours of reading via a browser or e-reader produces no eyestrain headaches (which it did before). However, if there is any light at all--say its dark but there's a four-inch sliver of dawn light gap showing through a blackout curtain, then I'll move the brightness scale up one notch. Very nice! I don't intend to test it, but I imagine that battery life extends a little with the dimmer settings as well.
Conversely, as near as I can tell, there seems to be no loss of light on the highest setting. We've had a late spring where I live, which means another overcast day, so I CAN'T test the Redfly outside in direct sunlight at its highest setting. Even so (cough, cough), I've been known to crank the Redfly up to the highest light/brightness setting so as to read old-fashioned paperback books at night. So I turn the freeware screen-flashlight utility up to high and then I crank the Redfly up to the highest setting, then situate the Redfly forty-five degrees so that the Redfly screen overtops the paperback book--ah--there seems no loss of light in the highest setting as near as I can tell as I can still read paperback books at night by the light of my Redfly!
I'll go ahead and retest the beta at work under flourescent lights. I'll also live with the settings for a couple of days. But my first impressions are that this is really, really good! For me this is a major update. Thank you so much laurieny!