I have 250wDE, and they are about 6 inches from the water.
I am running 14K Phoenix with 2/96 Actinic.
If you go to my picture thread I posted about 2 weeks ago, you can see this piece right in the middle, about halfway down.
I just put it there and expect because of the more direct light and flow, compared to where it was over by the Green Slimer before.
As far as coloring things up, I may have a different opinion on others. I find it easier to fry the brown out of them and then lower them rather than wait for them to color up. Seems to be a faster way for me.
When in good color, this one appears to have purple tips, which just are developing for me, a yellow to cream interior, with a rust-brick red (whatever you want to call it, but just not brown ehh?)
Though, I have a BB tank and is nutrient poor, so sometimes some pieces don't color/grow for me like they should normally.
Looking at some old pics, it looks like I have had it since October and hasn't done much. Probably too nutrient poor, but I am working on that by feeding more to get faster growth.