The pendant would cover max a 4'x4' cubed tank. I have it on my 94g cube (it is the only light needed) right now but I have the pendant sitting really low so if it was raised to about 12" above the water level is would cover more area.
As for the bulb, right now I have an XM 10K bulb which was installed in Feb. I love this bulb as it's the highest PAR bulb, and the 4 actinics balance out the blueness of the tank. Looks awesome. Previously I had a BLV 14K bulb from Nov-Feb which I found too blue (but others may like it on the bluer side). I would include both bulbs for the buyer to determine what they liked best, but plenty of life left on both.
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