Dominion Energylogin

The colour of the light we see is determined by its wavelength, which in turn is often used to denote the colour of light. The wavelengths associated with light are tiny and measured in nanometres (nm) - billionths of a metre. LEDs produce light that is almost coherent, meaning that it is almost all on one wavelength, giving very pure colours. Here is an approximate guide to the colours of light and their wavelengths. 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 - lime green 555nm - Blueish lime green 550nm - Emerald green 525nm - Pure green BLUE-GREEN: 505nm - Blueish Green 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 colour cast is generally in the centre of the beam and is usually slightly blue, surrounded by "pure" white. Colour 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.