http://www.canreef.com/ftotm/may06a/index.php
http://www.canreef.com/ftotm/sept06/index.php
http://reefkeeping.com/issues/2007-05/totm/index.php
These tanks all have acros on the lower portion of their tank - possibly deep water acros. Like you said, alot of reef keepers like to keep acros high up for two reasons:
1. Aesthetics - corals grow upwards.
2. Maximize (keyword) SPS growth.
The light you're using serves a third reason - your acro would most likely not thrive if it was placed lower in your tank due to a lack of light penetration. If that's the case, how many acros would you keep? The point being illustrated is that a better lighting system also allows a larger variety of locations for coral to be placed.