Which part of former does science not understand?
''white light'' is not a piece of bread, ''white light'' is the natural former, the visible spectrum 400nm-800nm are interference of the former, white light is not made of the later, the later is made out of the former, a former that has one frequency equal to sight.
400nm-800nm are invention by the observer effect.
Stop lying science.
Science doesn't work by naked assertion -- science works by observation and the testing of models to best predict how those observations make sense together.
Lots of things in nature turn out to be mixtures of purer things. Water can be decomposed into pure hydrogen and pure oxygen and those can be recombined back into water. Hydrogen cannot be decomposed into other chemical compounds, so Hydrogen is a pure component, fundamental to chemistry. We call this pure component an element.
That white light is a mixture was demonstrated by Newton. A prism or diffraction grating can separate white light from an incandescent source (the sun or a hot filament bulb) into a spectrum of pure color. A prism does this via dispersion while a diffraction grating does it directly based on the wavelength of each component.
Each isolated component cannot be further broken down, so they are pure. Each isolated component has a wavelength between about 400 nm and 800 nm.
Some components are invisible, such as those near 1000 nm -- but we have instruments which are sensitive to their presence.
None of the isolated pure components are white -- therefore all white light is a mixture of various pure components.
All or some of the isolated components may be reassembled using a prism or diffraction grating oriented in the proper direction, and doing so with all the components between about 400 nm and 800 nm we create a white light not seen in any one component. By mixing various parts we can explore how various mixtures are assigned colors by different people -- in doing so we discovered that there are at least 3 types of people who are blind to differences in color in various ways.
Further study has been made of the way the human perceptual system relates visual stimulus with perception of color which is why 3 channels of information are sufficient to reproduce a wide range (but not all) colors on a computer screen or television. This is also the basic science between "color matching computers" at paint stores. Some combinations are close to white while having quite a different distribution of components than incandescent white light. Fluorescent tubes and white LED bulbs are examples of "white by design."
The main reason that your ideas are not science is that you don't explain all of these observations with precision better than the current model. If you don't understand that, then you don't understand science.
