I like your attitude!
The reason your plants are doin so good is because they are getting more than enough lumens. The recommended amount of lumens per square foot is 5000-7000. Since your are getting almost 9000, they are really happy.
The color has nothing to do with lumens. It could be a perfect replica of the sun spectrum, but the lumen output is what matters.
I totally agree with your situation. It is really good for stealth growingm but like I said, not good for more than like 2 or 3 plants.
Usually flouros are either cool or warm white, and they usually run about the same price.