direct illumination

(redirected from vertical illumination)
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di·rect il·lu·mi·na·tion

an illumination in which the rays of light are directed downward, almost perpendicularly onto the upper surface of the object, which reflects the rays upward into the optical system.

direct illumination

direct illumination

The illumination of an object under a microscope by directing light rays upon its upper surface.
See also: illumination
References in periodicals archive ?
Literature Review for Vertical Illumination Publication Content Details Waldram (1958) Design process that takes the Theory appearance of surfaces into account Flynn (1977) Wall lighting in addition to Space: downlighting is more favorable than Windowless room horizontal lighting.
In exterior spaces, the vertical illumination of facades supports orientation in urban spaces and provides spatial framing of places (Fig.
In general, we can distinguish two types of vertical illumination, wallwashing and grazing light.
There are no standardized international recommendations for vertical illumination even though there are regional recommendations that focus on visual tasks [DiLaura and others, 2011].
A common example is the combination of northwestern, moderately inclined (30[degrees] to 60[degrees]) illumination with vertical illumination (Imhof 1982; Patterson and Hermann 2004).
An additional light pole was placed on the approach side of the crosswalks in order to produce 39 to 40 lux of vertical illumination at the crosswalk, as recommended by the Swiss.
The Holophane Enduratron product was selected for this mammoth space because of its ability to deliver both strong horizontal and vertical illumination.
The main goals of the lighting component of the revitalization efforts are to obtain high vertical illumination with no less than .
The pedestrian teardrop fixtures were selected for improved vertical illumination and facial recognition," says Windle.
LED track wall wash with a rectangle distribution delivering 3,000 lumen uniform vertical illumination in four color temperatures.
But Zeboor notes that "in many instances, due to the age of the metal halide lighting and poor vertical illumination, the gymnasiums appeared much worse than 25 fc.

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