Glare
Glare turns up in 2 fields: lighting, telecom & it. Here is what it means to the people in each one.
Glare in lighting
Visual discomfort or loss of visibility caused by excessive brightness or contrast in the field of view.
What happens when something in view, a lamp, a window or a reflection, is far brighter than the level the eyes have adjusted to. Discomfort glare makes people squint, complain and turn away without necessarily reducing visibility; disability glare scatters light inside the eye, washing out contrast, as with oncoming headlights. It depends on source luminance, size, position and background luminance, and is controlled with shielding, diffusers, cutoff and lower-luminance optics.
"Those high-bay lenses are pure glare from the forklift seat, put on the prismatic diffusers before the night shift starts."
Glare in telecom & it
A call collision that happens when an incoming and outgoing call seize the same trunk circuit simultaneously.
Glare is a signaling condition where a switch attempts to seize a two-way trunk for an outbound call at the exact same moment the remote switch seizes it for an inbound call. Because both ends are trying to use the same circuit, the call setup fails. Telecom systems resolve this by assigning a priority hierarchy, where one switch yields to the other and selects a different available trunk.
"We're seeing too much glare on the T1, so let's configure the PBX to hunt channels top-down while the telco hunts bottom-up."