To work with Glomania UV Black Light Paints and Glomania Glow in the Dark Paints and pigments we first need to understand light and wavelength. The information provided here is a guide to what its all about.

It is possible to see the content of a light beam with the help of a spectrophotometer.
This meter sorts the beam of light into wavelengths and measures the intensity of each wavelength.
These different wavelengths of light make the following color impressions on the human eye. 

The human eye is only sensitive for the part of the electromagnetic spectrum corresponding with the frequencies of about 4.0 x 1014 to 
7.5 x 1014  vibrations per second. However, it is not sensitive for all wavelengths to the same extent.
The so-called cones in the retina of the human eye are most sensitive for a radiation of 550 nanometer and is not coincidental the wavelength of the maximum intensity of the sunlight and gradually less sensitive for light with smaller and larger wavelengths than 550 nanometer.

However, in practice light exist mostly of different wavelengths, where the observed color impression depends on the intensity distribution of the wavelengths.
Two light beams can give the same color impression with considerable different spectral curves.

It appeared possible to classify color three dimensionally: the lightness or brightness as light and dark, the hue or color tone as red, orange, yellow, green, blue violet, and the saturation as more or less mixed with white light.
It seemed possible to reproduce a color by the additive color mixing of the right quantities of the three primary colors: red, green and blue.
Also, an additive mixture of two colors can be reproduced by the sum of two trios of primary colors, necessary to be able to reproduce both colors separately.

These observations gave considerable support to the trichromatic theories of the existence of three pigments in the retina of the human eye with a sensitivity for respective red, green and blue.

The three characteristics: the hue, the lightness and the saturation have been used for the compilation of systematic color atlas, like the Munsell atlas and the DIN atlas. Thousands of color maps are arranged in these atlases.

Color can arise in two ways: additive and subtractive.
The additive mixing is when two light beams are observed together and one can see the sum of both light intensities.
When two colors give white light when mixed, these two colors are called: Complementary Colors.

When one lets a beam of white light reflect a mixture of pigments or let the beam pass successively different colored transparent materials than the absorption curves of the reflecting or transparent materials are added and this is called the subtractive color mixing.
When two colors give no reflection or are black when mixed, these two colors are also called: Complementary Colors.

Up to now the circumstances that can affect the perception are mentioned.
In the first place a distinction has to be made between luminous and light reflecting object.

COLOR SPECTRUM.

The Additive Primary Colors     Red    Green    Blue

A mix of these Primary Colors    R + G + B = White

A number of pairs of pure spectral colors called Complementary colors also exist if mixed additively.
These will produce the same sensation as white light. 
Among these pairs are certain Red and Cyan, Green and Magenta, Blue and Yellow.

VISIBLE SPECTRUM.

The Visible Spectrum arranged in the order Red, Orange, Yellow, Green, Blue and Violet according to the different wavelengths
of Light with a seventh Color ( Indigo ) sometimes specified, between Blue and Violet.

The Light in the region with the shortest wavelength is seen as Violet. The Light in the region of the longest wavelength is seen as Red.
The light region which The Human Eye can see is called The Visible Light Region or The Visible Spectrum.

If we move beyond The Visible Light Region toward longer wavelengths, we enter the infrared region and if we move toward shorter wavelengths, we enter the ultraviolet region.
Both of these regions cannot be seen by The Human Eye.

Light has wave characteristics; wavelength is the peak to peak distance of two adjacent waves.

 Wavelength:

( symbol is λ ) is equal to the "Velocity of light" divided by the frequency. ( λ = 3 * 108/ f )
The wavelength of Light is so small that it is conveniently expressed in nanometers ( nm ) which are equal to one-billionth of a meter. Wavelength as the distance, measured in the direction of propagation of a wave, between two successive points in the wave that are characterized by the same phase of oscillation.

"nm" ( nanometer )

A unit of measure often used when discussing wavelengths of Light. 
µm (micrometer) is also used sometimes.

"Frequency"  

(symbol is f ) is equal to the "Velocity of light" divided by the wavelength. ( f = 3 * 108/λ )

"Velocity of light"

(symbol is c ) is approximately 300,000 kilometers per second ( about 186,000 miles per second ) 
( c = f * λ ) ( c as m/s ) ( f as "Hz" ) and ( λ as m )

"Hz"

Frequency is expressed in Hertz ( "Hz" ); a frequency of 1 Hz means that there is 1 cycle or oscillation per second.

"Energy"

The light has specific frequencies associated with the energy quanta. To remove an electron from an atom requires several electron volts, depending on the atom. There are 2.26 x 1025 eV in one kilowatt-hour. Visible light has a quantum energy of approximately 2 eV.

"eV"

Energy at the atomic level is commonly expressed in electron volts ( eV )

Length Conversion

1 nm = 10-9 m = 10-6 mm = 10-3 µm
1 µm = 10-6 m = 10-3 mm = 1000 nm

SOLAR SPECTRUM
The solar spectrum, commonly referred to as the sunlight, consist of ultraviolet light (UV), visible light an infrared (IR). 
The energy distribution within the solar spectrum is approximately 2 percent ultraviolet, 47 percent visible light and 51 percent infrared. 
The total distribution of the electromagnetic radiation in the wavelength region from 300 nanometer (UV) 
to 4000 nanometer (IR) is called the broadband, or total, solar radiation.

SUN 
The star that is the central body of the solar system, around which the planets revolve and from which they receive light and heat. 
Its mean distance from the earth is about 93,000,000 miles, its diameter about 864,000 miles 
and its mass about 330,000 times that of the earth.

SUNBOW
A bow or arc of prismatic colors like a rainbow, appearing in the spray of waterfalls, fountains, etc.

Most Glow in the Dark Pigments and UV Black Light pigments have an optimum wavelength of 365nm. Most LED’s supplied currently are 395 – 400 nm. This number is so close to the visible spectrum of purple that the hue from the led is a purplish color. True UV Black light like Woods Bulbs even now some UV 365nm LEDs project a black light. This wavelength excites these powders and makes them glow or fluoresce at their highest peak.

Older Post Newer Post