This spectrum seems quite realistic to me. Maybe 450 should be a little darker and the low 500 a little bluer but still one of the best spectrums IMHO.
Tilt your screen a little bit to get the colors correct,
I'm using a laptop ATM and when i tilt my screen back it makes a hell of alot difference and matches the nm up to pretty much exact !
I fancy a color range around 460nm and a 580nm <--- Looks pretty sick