Not a cheap soultion but one to watch, and makes a point to target both chlorophyll a and b
NICE! Might make that LED switch after all 
I like this one. Looking at the spectrum plots, it seems to be the first LED fixture that hits all four Chlorophyl optimal peaks in both the blue and red zones. it would be nice to see one in person over a tank. to see how the color adjsutments work too.
I’m sure it will an arm and a leg price for those LEDs
they are avaiable now and the 50XP goes for $729.00 ea.
same or more output as a 250W MH and about the same Spread so two for a 48 " tank or 3 for 72"
or if you have that Extra deep tank or want to hang them high to get more spread the 100XP goes for $859.00 ea. and is compared to a 400W MH
way too much money 300 maybe