Question: WavelengthToColor values and color

One might be flabbergasted by the following

with(ColorTools):

Colors dosn't appear to match values given from this wavelength to rgb converter from here https://www.johndcook.com/wavelength_to_RGB.html

Although the color is in agreement when converting the value given back into a color value.

So in maple WavelengthToColor(622) does not match the color above however (heads up using the method="linear" option makes it closer) if we go through the paces and convert #ff6f00 to a color, it comes out properly.  One might think is something wrong with the WavelengthToColor command?

HexToRGB24("#ff6f00")
              

RGB24ToRGB([255,111,0])
                 

Color([1,.43529412,0])

Ok the color seems right but that's not what WavelengthToColor(622) gives

WavelengthToColor(622)
        

So as it turns out using method=linear makes it closer.

Time is short I haven't time to compose the question properly but likely has something to do with the HSV Colorspaces.  It's confusing.