Note: That's not an instant change in color, that's showing what color changes are present with the plants as they grow with the two different bulbs.
wrong..that is the same tank,pics taken a few minutes apart ( how ever long it took to change the bulbs out ) look again.. top pic is a 9325K (bright and white),bottom is a 6700k (yellow and pale) go look through the link I posted earlier,there are other pics,,some 8000k,some 10000k etc..