Steve... I saw the demo of the new Impressionist series... looks pretty cool.. it will have it's niche.. for sure.
Also.. on the L70... I think that another factor that presents itself in that whole discussion with regards to office lighting, is that most office lighting will be effected by ambient light that comes in through the windows. As such, that ambient light will fill in the void created by dimming down to 70 %. Just a thought that popped in my head when I read your post.