xm 20k bulb questions

[dodger745]

Its time for me to change bulbs. I have 250 watt DE Halides.
Right now I have the aqua line bulbs that came with the fixture. they are 20k
I'd like to go back with 20k and it looks like I can buy the xm bulbs for a great price.

opinions on the XM Bulb?

I know everyone loves the phoenix 14k, However Ive seen them on several tanks and I really like the 20k look better.

 

[Reefing Madness]

XM is a good bulb. 20ks look really nice on a tank, but don't do alot for coral growth, thats why most go with the 14k.