Photometry can refer to: *

Photometry (optics) Photometry is a branch of optics that deals with measuring light Light, visible light, or visible radiation is electromagnetic radiation that can be visual perception, perceived by the human eye. Visible light spans the visible spectr ...

, the science of measurement of visible light in terms of its perceived brightness to human vision *

Photometry (astronomy) In astronomy, photometry, from Greek '' photo-'' ("light") and '' -metry'' ("measure"), is a technique used in astronomy that is concerned with measuring the flux or intensity of light radiated by astronomical objects. This light is measured t ...

, the measurement of the flux or intensity of an astronomical object's electromagnetic radiation * A

photometric study Architectural lighting design is a field of work or study that is concerned with the design of lighting systems within the built environment, both interior and exterior. It can include manipulation and design of both daylight and electric li ...

, sometimes also referred to as a lighting "layout" or "point by point"

See also