Well I'm just a lowly retailer... not nearly so sophisticated as all that.
I mainly buy wholesale and sell retail but I also trade in frags and frag a few here and there. I keep them under MH, but I keep them under lighting that is more likely to be similar to that of the hobbyists who will buy them - this way there is less chance of a client being disgruntled if the coral changes colour dramatically, 3 months after it leaves my shop.
Even with my simple technique, stuff I get grows and keeps good colour, and tends to keep it after it goes home, because I educate people and encourage them to supply their livestock with appropriate lighting. In just over 4 years in the trade, I have yet to sell a 1000 watt light fixture. The few that splurge on halides usually go with 175s or 250s depending on the depth of their tank, and what they wish to keep.
It is from*that* point of view that I ask my questions, which seem to continue to go unanswered.
As I mentioned before, and as Mitch understood me, I fail to see the value in stressing a coral to shift its physiology to achieve an unnatural colour. Sure it's pretty... but it's likely temporary.
Last month I attended a lecture by Dr. Bruce Carlson and in his discussion he explained that Zooxanthellae are brown, and colours other than brown in corals, are actually an absence of Zooxanthellae. Bleaching, in fact, in extreme cases. While it's possible for some specimens to maintain a smaller amount of Zooxanthellae and for those specimens it's "normal" for them to show colour, IMO it's probably rather stressful to push the limits of that.
FWIW..
Jenn