All freshwater aquaria lights give off white color, it's what we as humans perceive it as. Some are however, tinted when compared to others. It's classified in heat ranges (8,000K, 10,000K, etc.). The hotter the rating, the more "purple" the bulb will be. If you want the least altered lighting, i would suggest asking a LFS for a bulb that is used for growing plants, I find those to be the "whitest".