Can't say I didn't warn you
I had a Giesemann 13.5k SE and it was super yellow. (even with actinic supplimentation)
Seriously, go up to Oceans and buy an EVC 14K bulb. They are super bright and have a fantastic blue colour. If you recall their SPS tank they are using a 400W 14k EVC.
I am using a 250W EVC 14k and I love it.