The range of color in LED lighting is...strange. The “bulbs” I bought last fall are more blue in color and they glow for a while after you turn them off! The chandelier style in the ceiling fan are warmer and look more light frosted incandescent bulbs. I am noticing a lot of improvements in the newer bulbs, and I hope the price comes down, too.
My office does have a north window. In Michigan, however, good lighting is hit and miss! XD
A little science demo--for free! ≤}B^)
A white LED, if it's the single chip type, produces its white light similarly to a fluorescent lamp: The actual wavelength coming out of the LED chip isn't suitable for direct illumination; instead, it's there in order to 'excite' a coating of phosphorus compounds which fluoresce in response; that is, they absorb the light from the LED and turn it into a spectrum of colors that add up more or less to white.
[[In the case of the fluorescent lamp, the excitation is from an arc through mercury vapor, giving off most of its output in the ultraviolet. Most 'black' (i.e., UV) lamps are just like fluorescents, but without the phosphor coatings.]]
The more artful (and expensive) the blend of phosphors, the better the quality of the white light.
The phenomenon of fluoresence is closely related to that of phosphorescence, in which a substance stores absorbed light energy as excited atomic states, which then decay and give off light after the exposure is ended--in other words, they 'glow in the dark.' Fluorescent materials almost always exhibit some degree of phosphorescence.
End of didactic rant.