relationship between LED wavelength and color
The color of light is determined by its wavelength. The wavelength of the light is in nano scale. The following is the color of the light and the wavelength of the light:

Infrared red 1600nm - 4600nm - invisible light
Low infrared red
870nm - 1300nm - no visible light
810nm - 850nm - almost invisible light
Near infrared light
780nm - when direct observation, you can see a very dark cherry red light.
770nm - when direct observation, you can see a deep cherry red light
740nm - deep cherry red light
Red light
700nm - deep red
660nm - red
645nm - fresh red
630nm -
620nm - Orange
Orange light
615nm - orange color
610nm - orange light
605nm - amber light
Yellow light
590nm - "sodium" yellow
585nm - yellow
575nm - lemon yellow / light green
green
570nm - pale green
565nm green
555nm -
550nm - fresh green
525nm - pure green
Blue green
505nm - Green / blue
500nm - light blue
495nm - sky blue
blue
475nm - azure blue
470nm - 460nm- bright blue
450nm - pure blue
Blue purple
444nm - deep blue
430nm - blue purple
Violet
405nm - pure purple
400nm - Deep Purple
Near UV light
395nm - deep purple with reddish purple
Type UV-A ultraviolet light
370nm - it is almost invisible, and a dark purple color is shown in the light of the wood glass filter.
White light emitting diode with slightly yellow to purplish white light. White light emitting diode with low color temperature range to 4000 DEG K to 12000 DEG K. Common white LEDs are typically 6500 to 8000 degree K.