You've got an error in how you setup the if-expressions. For example, you need to change the first if-expression from
320 < wavelength < 325
to
320 < wavelength && wavelength < 325
Change the others in a similar manner, and try again.
To explain, note that
320 < wavelength < 325
is syntactically correct, but is the same as
(320 < wavelength) < 325
and reduces to either
0 < 325
or
1 < 325
I doubt this is what you intended.
