MID INFRA-RED:
4600nm - 1600nm - Invisible.
LOWER INFRA-RED:
1300nm - 870nm - Invisible.
850nm - 810nm - Nearly invisible, a very dull red glow can sometimes be observed when viewed directly.
NEAR INFRA-RED:
780nm - Very dim cherry red when viewed directly.
770nm - Deep cherry red when viewed directly.
740nm - Deep cherry red
RED:

700nm - Deep red
660nm - Red
645nm - Bright red
630nm - "He-Ne Laser" red
620nm - Orange-red
ORANGE:
615nm - Reddish orange
610nm - Orange
605nm - Amber
YELLOW:
590nm - "Sodium" yellow
585nm - Yellow
575nm - Lemon yellow / greenish
GREEN:
570nm - Blueish green
565nm - Blue-green
555nm - Blueish lime green
550nm - Emerald green
525nm - Pure green
BLUE-GREEN:
505nm - Greenish blue / turquoise
500nm - Greenish cyan
495nm - Sky blue
BLUE:
475nm - Azure blue
470nm - 460nm Bright blue
450nm - Pure blue
BLUE-VIOLET:
444nm - Deep blue
430nm - Bluish-violet
VIOLET:
405nm - Pure violet
400nm - Deep violet
NEAR ULTRA-VIOLET:
395nm - Deep purple with a slight red tinge.
ULTRA-VIOLET (UV/A):
370nm - Nearly invisible, can appear a dull, deep purple when filtered with Wood's glass.

WHITE:
White LEDs come in a wide range of shades from yellowish to purplish white. The most noticeable color cast is generally in the centre of the beam and is usually slightly blue, surrounded by "pure" white. color temperatures for common types of white LED range from the low 4000°s to nearly 12000°K, with the most commonly found white LEDs being in the 6500° - 8000°K range. "Daylight" for photographic purposes is 5600°K. Most incandescent domestic light bulbs barely achieve 2500°K.

WHITE light allows perfect color distinction, but can spoil dark-adapted vision, which then requires a period of re-adjustment, once the light source is extinguished.
RED light is traditionally used for preserving night vision. Red light does not cause your pupils to contract so much and as a result your eyes do not need to re-adjust to the darkness once a red light is turned off. Red light is also used as a "safe" color in monochrome photographic processes and does not spoil film which is being developed.
YELLOW light offers some benefits of both red and white lights. While providing reasonable color distinction, it allows a reasonable level night vision to be maintained, if it is at a low enough level. Another benefit of yellow light is reduced reflection and glare when reading, leading to reduced eye strain over longer time periods.
GREEN light can also be used to preserves night vision, but with the improved ability to distinguish colors - particularly useful for reading a map or chart at night. It is also less easily detected by night vision equipment, but more easily detected by the human eye, at lower brightness levels than a red light.
BLUE can also be used to read maps at night and is often preferred by military personnel, as it increases the level of contrast. It is also the classic backstage working light color for theatres and shows.
BLUE-GREEN brings similar night vision benefits to the green light and the blue light, but with improved color distinction. Some users prefer the blue-green light for this reason.

INFRA-RED is for use in conjunction with night vision equipment. Otherwise invisible to the human eye.
ULTRA-VIOLET is most commonly used to detect forged banknotes, which glow under UV light. Some UV LED torches have become popular at clubs and parties, where they are used to make fluorescent materials shine brightly.