sorry, i just checked out the link and looked into the bulbs that are available.
IMHO, the XM 10k (what i run right now) are to yellow unless you supplement with crazy amounts of
actinics.
the 15k bulbs have less
par than the 20 k's but are not as blue. and you want a good
par rating so you can keep light demanding corals on the bottom half of the tank.
the 20k bulbs have a DECENT
par, but,
IMHO, are way to blue (for my taste).
