Visible Light
Wavelength, Frequency, Color Compatibility

Since a lot of work these days involves properties of light in the visible spectrum (displays, LEDs, emitters/detectors, etc.), this spectrum chart and color wheel should prove useful. Information on light addition and subtraction is included in the familiar Venn diagram format.

The visible spectrum is the portion of the electromagnetic spectrum that is visible to (can be detected by) the human eye. Electromagnetic radiation in this range of wavelengths is called visible light or simply light. A typical human eye will respond to wavelengths from about 380 to 750 nm. In terms of frequency, this corresponds to a band in the vicinity of 790–400 terahertz. A light-adapted eye generally has its maximum sensitivity at around 555 nm (540 THz), in the green region of the optical spectrum. The spectrum does not, however, contain all the colors that the human eyes and brain can distinguish. Unsaturated colors such as pink, and purple colors such as magenta are absent, for example, because they can only be made by a mix of multiple wavelengths. - Wikipedia

Here is the C.I.E. Chromaticity Diagram.

Gamma Rays	X-Rays	Ultra Violet			Infrared	TV	Radio
Wavelength (nanometers)

Additive Color System (adding colors to ultimately make white)				Subtractive Color System (subtracting colors to ultimately make black)
Primary additive colors for light are Red, Green and Blue				Primary subtractive colors for light are Magenta, Yellow and Cyan

Color Wheel

Wireless System Designer
RF & EE Symbols Word
RF Stencils for Visio
Calculator Workbook
RF Workbench
Smith Chart™ for Visio
Smith Chart™ for Excel

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Webmaster:
Kirt Blattenberger,
BSEE - KB3UON

RF Cafe began life in 1996 as "RF Tools" in an AOL screen name web space totaling 2 MB. Its primary purpose was to provide me with ready access to commonly needed formulas and reference material while performing my work as an RF system and circuit design engineer. The Internet was still largely an unknown entity at the time and not much was available in the form of WYSIWYG ...

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