angle of illumination

angle of illumination

The angle between the axis of an illuminator and a perpendicular to the surface being illuminated.
References in periodicals archive ?
Automotive effect coatings usually contain flake pigments, which act somewhat like a mirror, causing the color to change based on the angle of illumination or view.
In order to achieve these objectives, Regula took the approach of using the DOVID's inherent ability to diffract white light into its component colours with varying the zenith angle (angle of illumination).
The result was an impressive 60 per cent increase in the light extraction efficiency and 15 per cent wider angle of illumination.
b) The angle of illumination must not exceed 60 degrees
As it orbits the Earth, its angle of illumination by the Sun slowly changes, and the shape of the illuminated portion (known as the phase) changes from a thin crescent , through to a first quarter (or half Moon), to being fully lit (full Moon).
The pendant rod option extends the spotlight down from the ceiling, for a different angle of illumination.
The front fog lamps, now integrated into a trapezoidal front bumper, provide a wider angle of illumination. Viewed from the side, new Avalon is enhanced by additional use of chrome trim, redesigned rocker panels, and glare-resistant outer mirrors with integrated turn signals.
Quoting extensively from Webb's response, Birt published a paper in the Monthly Notices of the RAS in 1862, where, according to Webb, 'Schroter had watched and measured from it [Alhazen] for years, and found it too varying in aspect to be accounted for by the varying angle of illumination. At first it was a depressed surface surrounded by a ring, and distinguished from the neighbouring objects under all angles by its dark tint.
Pearlescent pigments are used to achieve vivid interactions of color and luster with the added dimension of variation depending on the angle of illumination and observation.
But if you look at Deslandres within a day of lunar sunrise, when the angle of illumination is very low and shadows stretch long across Hell Plain, you may catch a most bewitching feature.
Here, chiaroscuro isn't a painterly illusion but an actuality: Volumes of light and lacy silhouettes of shadow shift with the angle of illumination. Most of Booth's glass sheets lean against walls--their bottom edges resting either on the floor or on low, wooden platforms--and triangulate into sculptural objects, even if the space they describe, between glass surface and wall shadow, is discreet and inaccessible.
LVMH looked at the change in angle of illumination of special effect (flip-flop) pigments using the multi-angle spectrophotometer MA68II.