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Weber–Fechner law
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The Weber–Fechner laws are two related scientific laws in the field of psychophysics, known as Weber's law and Fechner's law. Both relate to human perception, more specifically the relation between th
Uneven light from a window
Uneven light from a window
The same light, redistributed by prism tiles in the window
The same light, redistributed by prism tiles in the window
Threshold increment versus background luminance for various target diameters (in arcmin). Data from tables 4 and 8 of Blackwell (1946), plotted in Cru
Threshold increment versus background luminance for various target diameters (in arcmin). Data from tables 4 and 8 of Blackwell (1946), plotted in Crumey (2014).
Prism lighting
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Prism lighting is the use of prisms to improve the distribution of light in a space. It is usually used to distribute daylight, and is a form of anidolic lighting.
Weber–Fechner law
…by a single function across all frequencies: Δ I / I = 0.463 ( I / I 0 ) − 0.072 . Vision Uneven light from a window The same light, redistributed by prism tiles in the window Because of the ~logarithmic perception of light levels, if light is redistributed from the brightest parts of a room to the dimmest, the…
Optimal daylighting of a room using prism lighting. Prism tile canopies outside send light skimming across the ceiling, so that it penetrates deeply i
Optimal daylighting of a room using prism lighting. Prism tile canopies outside send light skimming across the ceiling, so that it penetrates deeply into the room.
Suboptimal use of prism lighting. Daylight redirecting film stuck to the inside of the windows reflects light sharply up onto the ceiling, mostly ligh
Suboptimal use of prism lighting. Daylight redirecting film stuck to the inside of the windows reflects light sharply up onto the ceiling, mostly lighting the area nearest the window.