source of illumination

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Noun1.source of illumination - any device serving as a source of visible electromagnetic radiation
device - an instrumentality invented for a particular purpose; "the device is small enough to wear on your wrist"; "a device intended to conserve water"
lamp - an artificial source of visible illumination
light source, light - any device serving as a source of illumination; "he stopped the car and turned off the lights"
ultraviolet lamp, ultraviolet source - any source of illumination that emits ultraviolet radiation
References in periodicals archive ?
Ambient describes the main source of illumination for a room or space typically overhead fixtures that light the entire room ,or the first switch you turn on in a room.
In reality, your handheld light is your primary source of illumination until you've made the decision to engage a target.
The detail is clean, allowing focus to be on the wall and not on the source of illumination.
The light cast on the wall by a nearby projector took the form of the very same line, swaying at the speed at which the film reel passed before the source of illumination.
The USO Three quarters into the 1,300-yard journey to Woodside (where the boat would be tethered at the quayside of another abandoned dock), the street lamps of Birkenhead could be seen as faint pinpoints of light through the fog, but there was another source of illumination nearby, and Stuart could see it was coming from under the Mersey.
Light from the star shining on the inside of this cavity is believed to be the source of illumination of the fan-shaped reflection nebulae which we typically see.
Another such gathering might be Blake's "world in a grain of sand," and another metaphor for this kind of expansive extrapolation of an entire cultural history from a single event in time and space might be (as Nemerov mentions in a later chapter) George Eliot's polished pier-glass in Middlemarch, which at first seems smooth and polished but when a candle is brought close by, demonstrates dozens of tiny scratches that appear to form perfect circles around the source of illumination.
They stand in isolation from their surroundings as the only source of illumination and take on a beauty and iridescence that is not normally associated with household objects.
LEGO' lights combine the fun and nostalgia of LEGO' toys with a handy source of illumination wherever a little extra light is needed.
Left and far left, one of Coventry's band of gas lamp attendants, with his bicycle and ladder, doing routine maintenance in February 1960; below left, old and new street lamps showing the difference between gas (on right) and electric (on left) in Binswood Avenue, Leamington in March, 1958; below centre, an oil-lamp was the only source of illumination for households before gas & electric lighting; below right, one of the last gas street lamps in Wyke Road, Wyken in February, 1963.
The process uses a blacklight source of illumination, which limits light pollution to the minimum.
They are passive in the sense that they use the ambient light described above as their source of illumination.