alot of people still run halides and have great coloration growth etc but ive seen the same with LEDs as well it all depends on whos running them and knowing how to fine tune everything to make them apealing
also a lot of people buy cheap LEDs and dont like them...its kind of the same as buying cheap bulbs for t5 or MH you just wont get the same appearance as if you were running high end stuff or make it yourself no matter the lighting source and those are some reasons for people switching back
a lot of people also say the coloration isnt as nice but they dont factor certain things in:
1-LEDs tend to have much higher par then even MHs so if you dont run them at the same comparible outputs it can have ill effects on your corals
2-corals have been grown under MHs and T5s for generations, 6 months to a year might just not be enough time for them to fully acclimate to the different lighting and spectrums being hit
3- if the wrong optics are used on LEDs you may not get the coverage you would expect etc
4- this is something that needs to be researched into a bit more....Par isnt actually that important for lighting, Pur is what is important and there really isnt a whole lot of research going into Pur for just about any lighting system....for all we know MH could have highest Pur or it could be LEDs so that is also something that needs to be explored into
i have seen great tanks with all lighting systems on it....2 out of my top 5 tanks ive seen run LEDs....one runs Radions and the other Ai Vegas.
fact of the matter is different stuff work for different people depending on how well you can tune your coloration through lighting....LEDs are starting to take over by storm with vendors and coral farmers so they have to be doiing something right, i feel like i see
kessils popping up everywhere with vendors and are doing a great job from what we see and buy