Table 1.

Glossary of lighting-specific terms

Term	Definition
Glare	A visual sensation caused by excessive brightness.
Disability glare	Reduced vision caused by light scatter from a bright source.
Discomfort glare	Sensation of discomfort or annoyance caused by bright light [83]
Luminance	Intensity of light per unit area travelling in a certain direction [84]
Mesopic	Mesopic conditions exist in the range between photopic and scotopic, and mesopic vision involves both rods and cones.
Photopic	Photopic conditions are well-lit (e.g. outside on a sunny day), and photopic vision involves cones, facilitating colour perception.
Scotopic	Scotopic conditions are low light conditions (e.g. outside at night under starlight). Scotopic vision involves only rods, providing limited colour perception.