I recently changed my 250W Geisemann bulbs for Aquaconnect and I have to say I really really like these bulbs. I also cannot suppliment with actinics and the Aquaconnect have a nice crisp white with just a hint of blue.
FWIW the XM 20000K bulbs have a very poor rating. I have tried them and they are VERY blue which is probably an indication that you are not getting very much beneficial light penetrating for your corals.
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