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I think you should go with cree xhp50.2.

They are much brighter so you can use two Leds on each driver instead of regular eight 5w cree leds.
Less effort in building and maintance.

They run on 1500 ma.
1 * Ldd1500 driver is an excellent choice for two leds.

You mentioned a 24v psu.
That will limit you to less than half of the ldd max capabilities.
I would choose a descent 48v psu.
I just bought a meanwell 48v/350w for 35$.

I also didn't see any cooling fans in your plan.
You need fans.

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Remember the deferent leds have deferent current limits.

Usually the whites at 1500 ma and reds, csyan etc run at 700 runs at 700 ma max.

Don't combine deferent leds on same driver unless they have the same specs.

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