We try to imitate nature, sun intensity at various depths, which is not easy in such small scale, and really, any tank size is small scale compared to natural habitat of corals and fish....
Second, in our rooms we have stationary source of light, and stationary object, and in nature, things is far more complicated.....
Many lights dont have separate control of intensity and spectrum, meaning you can't adjust blues to 100% power, and 20% intensity.... also, same on other channels, on all of them intensity equals power in wats, which is ok, but much easier to set up things in wrong way, affecting par in favor of "color".....
Maybe high end lights have way to work around this, but, lower end units don't, so, wanna more natural color? Sure, reduce blue channel, and loose 30-60% of actual par.....
Personal preference and believes is something that i respect, and don't touch, but for me, that is main reason to have stronger white channel, well, stronger than modern lights have...
So that u can regulate color "temperature" with increasing blue channel power, and have good par numbers, instead of regulating color with reducing blue channel, and loose par....
Like i said, i bought popbloom lights, where is exact situation, white channel is weak, so, if i want more natural look instead of washed dark blue color, i need to crank white up, but also lower blue, and most par power of these lights are in blue channel....
On the other hand, chinese black box have app. same ratio of blues and white, so, i can set white channel (and par) to what i like, then add or subtract blue channel how i want, and loose, or add, smaller amount of par...