Best 20K Bulb for my LPS Tank

[jasper24]

Could you please recommend the "best" 20K DE HQI bulb for Par and appearance? I have a 58G display with an Outer Orbit 2 x 150 with 4 x 39W T5 actinics. I want to enhance the appearance of my Lords, Micros, Palys, etc. Thanks!

 

[All Delight]

I'm using a helios (sp). I don't know its par, but I like it. I wanted to get the xm but heard the xm hqi's aren't good. Bummer cause I've seen the single ended 400 watters and they look nice.