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119:: halving the light level does not halve the perceived brightness of a space, it makes it look only slightly dimmer. If light is redistributed from the brightest parts of a room to the dimmest, the room therefore appears brighter overall, and more space can be given a useful and comfortable level of illumination (see before and after images from an 1899 article, left). This can reduce the need for artificial lighting.
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189:, but when the sun is high, they tend to send the light up at the ceiling, not deeper into the room. Prism-based films are translucent rather than transparent, but offer finer control over the direction of the outgoing light beam; the film can be made in a variety of prism shapes to refract light by a variety of angles. Prism-based films are a lighter modern version of glass
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canopies mounted outside over the windows send light skimming across the ceiling, so that workers deeper in the room also have natural light coming over their left shoulders. Multiple prescriptions of prism tiles are used, so some light is also sent horizontally and slightly
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can bend beams of light. This bending of the light allows it to be redistributed. The prism structure only bends light appropriately at certain angles; if the angle of incoming light changes, a variety of prisms or a movable prism awning may be needed.
73:(DRF) is a thin, flexible plastic film which can be applied to a window to refract or reflect incoming light upwards so that the deeper parts of the room are lit more evenly. It can be used as a substitute for opaque blinds. It is a form of
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Daylight redirecting window film was initially made of one redirecting film and one glare-reducing diffusing film, often located on different interior surfaces of a double-glazed window, but integrated single films are now available.
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There are two types of film. Some film is moulded with tiny triangular prisms, making a flexible peel-and-stick miniature prismatic panel. The prisms are joined at the edges into a sheet. A prism sheet is somewhat like a linear
51:. While the ceiling does diffuse the reflected light, it still mostly lights the area nearest the window, where it is superfluous. However, glare is reduced without reducing the amount of daylight in a room.
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The reflection-based daylight redirecting film, stuck to the inside of top part of the windows, is reflecting light sharply up onto the ceiling. This is a suboptimal use of
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233:"Pocket Hand-book of Electro-glazed Luxfer Prisms containing useful information and tables relating to their use For Architects, Engineers and Builders."
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The same film in a similar room, but at another sun angle. The light is reflected at a shallower angle, lighting the room more evenly.
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141:, electricity costs, and existing lighting type. At 2014 costs, including labour, payback time may be measured in decades.
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171:, but each ridge may be identical. Unlike a Fresnel lens, the light is not intended to be focused but used for
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Jianhong (Jackie) Shen; Yoon-Mo Jung (2006). "Weberized
Mumford-Shah model with Bose-Einstein photon noise".
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Another film is moulded with thin near-horizontal voids protruding into or through the acrylic; the slits
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light hitting their top surfaces upwards. Refraction is minimized, to avoid colouring the light.
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While the films do save energy from lighting, the savings vary substantially by climate,
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are also used for cooling and heating energy saving, and to block UV.
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264:, U.S.A. Department of Defense ESTCP Project number EW-201014
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Padiyath, Raghunath; 3M company, St Paul, Minnesota (2013),
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The same light, redistributed by prism tiles in the window.
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Object of the Moment: 3M Daylight
Redirecting Film by 3M
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on a flexible polyester backing, one side coated with a
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Optimal daylighting of a room using prism lighting. The
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Henry Crew, Ph.D.; Olin H. Basquin, A.M., eds. (1898),
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Astronomy and astrophysics with elements of cosmology
383:, Energy Efficiency Emerging Technologies. E3tnw.org
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280:: CS1 maint: multiple names: authors list (
284:) CS1 maint: numeric names: authors list (
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155:Daylight redirecting film is made of
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187:transparent (both are translucent)
115:The human eye's response to light
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261:Daylight Redirecting Window Films
374:Daylight Redirecting Window Film
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185:The slit-based films are more
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163:(to make it peel-and-stick).
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394:"SerraGlaze : Q&A"
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161:pressure-sensitive adhesive
96:Uneven light from a window.
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350:10.1007/s00245-005-0850-1
305:. CRC Press. p. 20.
127:total internal reflection
71:Daylight redirecting film
401:Sweets.construction.com
445:Energy-saving lighting
299:V. B. Bhatia (2001).
440:Solar architecture
379:2019-02-14 at the
328:Appl. Math. Optim
312:978-0-8493-1013-3
173:anidolic lighting
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404:. Retrieved
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169:Fresnel lens
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406:13 February
212:Window film
191:prism tiles
151:Manufacture
434:Categories
268:2017-10-09
218:References
123:Refraction
35:downwards.
32:prism tile
336:CiteSeerX
455:Plastics
377:Archived
358:18794171
276:citation
237:Glassian
201:See also
81:Function
180:reflect
157:acrylic
129:inside
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139:aspect
397:(PDF)
354:S2CID
408:2019
307:ISBN
286:link
282:link
125:and
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