The main contribution of this paper is in (1) presentation and discussion of the measured optical spectra that was emitted by a free burning electric arc generated by various voltage values, (2) indication of the dominant wavelength
contained in the measured signals, (3) calculation of two dimensionless factors: peak and shape coefficients, which may be used for diagnosis purposes, and (4) calculation of the energy content in three spectral ranges of the electromagnetic radiation: ultraviolet (UV), visible light (VIS), and near infrared (NIR).
Although the boundary between the two regions is indecisively distinguished, it depends on the dominant wavelength
([lambda]) emitted by the source and near-field region is generally defined as within a quarter wavelength.
Integrating Tube systems produce highly accurate and repeatable measurements of total flux, chromaticity, peak wavelength, dominant wavelength
, CCT and CRI.
In addition, colorimetric parameters of the white-light LED were tested with CIE chromaticity coordinates (x, y) of (0.349, 0.393) and correlated color temperature of 4991K with a dominant wavelength
of 564 nm.
Here kE is the illuminance attenuation coefficient, which generally depends on LED colour (dominant wavelength
) and fog type, and xE is the fog layer thickness (equalled 1 m in this case).
Hue is the dominant wavelength
of a particular color, though in imaging we tend to use red, green, and blue filters to mimic our eyes' response to light.
For example, LEDs may be binned according to any combination of forward voltage, luminous flux, correlated color temperature (CCT) for white LEDs, or dominant wavelength
for color LEDs.
The important thing in the perception of colour is the understanding of the role of chromatic mechanisms in the area of perception (Huang et al., 2007).Stimulus contrast is a subjective psychological experience, and it proves the fact that the same physical stimulus (the same dominant wavelength
) with different people caused different color experiences (Milkovic 2006; Kovacic et al., 2009).
That stimulus contrast is really a subjective psychological experience proves the fact that the same physical stimulus (the same dominant wavelength
) with different people causes various feel (experience) of colour.
Lightness Compression, Dominant Wavelength
, and Hue Perception
Both the XT-24 and XT-27 chips are offered with a typical dominant wavelength
A B-B effect appears when stimuli similar in [[lambda].sub.D] (dominant wavelength
), but of different intensity, are perceived as different hues.