First of all, the CF stands for Compact Fluorescent. If the twist bulb you have is soft white, that is a yellowish-white light much like a regular incandescent bulb then it should be the right spectrum, I wouldn't waste my money on the colored ones. What you should do, in my opinion is get a couple more of these twist bulbs, and position them close to the bud sites, I have found that they can be as close as 1".

Hope this helps..

L0rdsOth