as i have quoted on my first post in this thread, i am not sold out to the idea of led lights on sps tank. and why do you think i would fix something that is not broken in my system? since you are promoting LED is better than halides, why not show us the fruits of your led tank instead?
chill bro and don't be too worked out, not trying to get into arguments but seriously, halides vs. led? there is totally no comparison. as you have mentioned, other water parameters affect growth and colouration, so the best way to compare as i previously mentioned is under same water yet isolated. until such justified comparison is produced i won't buy the idea of led for sps. VIvi Aquariums is marketing led lights for reefers, I would have done the same thing if i am in this business.
you should know by now that i have been reading and searching answers for led lights for sps tanks; for obvious reasons, i would want to venture in something less costly in the long run. but as of date, i find led has not reached what halides can achieve for the hobbyists; it will definitely sooner or later but not now. so till the time it has been proven by the majority of sps reefers, i'd stick to halides.
bottomline; Vivid aquarium has not convinced me of a justified comparison other than the technology led carries, and the products they carry
cheers!