XMs have the lowest output of all the 250wattDE 20,000Ks. My favorites are the Aqualine 20,000K and the EVC. The EVC is perhaps the brightest 20,000K, only 10-15% less output than a pheonix, and very similar in looks as well (more purple though, and less 'washed out' looking). FWIW, if you use actinic supplimentation, a pheonix 14,000K is a 20,000K thats just missing the actinic spike, so combining the pheonix with a couple actinic tubes would be a 20,000K look as well.