400w radium bulb with coralvue dimmable ballast

[sw500]

I have the coralvue 400w dimmable ballast with 12k reeflux bulbs,when I turn the ballast all the way down it's a nice blue,but I won't that same blue with the ballast turned up for the par, so I got the radiums put them in and there white,it's been about 20 min there starting to get blue,will they get bluer as they burn in. Thanks