What bulbs do I want?

[burrows14]

I've decided to replace my MH bullbs. This is the first time ive had to replace them and have little knowledge of what to buy. I have a 48" coralife 2x250w DE MH with actinics. I am a lil confused with what 10k 12k 14k...etc...etc means. I really like the crisp white/blue look but more on the bluer side(if that makes any sence lol) if someone could suggest what i should get or maybe you folks could post pics of what the lights look like in your tanks that would be awesome! plus you can show off your tank haha

Cheers
Ray