Your not quite right on your led rant sorry. Mh and t5's and pc the best method of comparison is par. But for LEDs the best measurement of their effectiveness is pur.
Mh and t5 only have the blue an white look. LEDs have numerous color combinations blue, royal blue, white , red, violet, ultraviolet to just name a few. LEDs are replacing hid lighting in the rest of worlds application so its safe to assume they will be here for a while. They run a lot more efficient than halides an cooler.

Long term resale is not something most companies are looking for. Because they designed their units to be able to be upgraded that is why they are modular. You don't have to buy bulbs every eight months but you will have the option to swap put for better diodes.

Mh are awesome for coral growth but LEDs are now showing to be as effective. And have more of an ability to make your colors pop. The long term data isn't there yet. But it will be after the short term results we have seen.