What is you're building? An algae scrubber? My experience growing aquatic plants has been that light intensity matters more than spectrum. If they have a listing for PAR values, get whichever is higher, otherwise go with whatever has the higher lumen rating. Blue light penetrates water far better, but I assume you're growing your algae in very shallow trays or some similar set-up. Higher light always equals more chance of running into algae issues.
I primarily deal with FW plants, but from my understanding marine algaes are generaly adapted to using primarily blue light. This makes sense as red light is more or less absent below a meter or two in the water column.
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