Lighting Design Week 4
Lighting Design Week 4 308
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This 2 page Class Notes was uploaded by Kaylee Lynn Rowland on Friday September 30, 2016. The Class Notes belongs to 308 at University of Wisconsin - Stout taught by Julie Peterson in Fall 2016. Since its upload, it has received 3 views. For similar materials see Lighting Design in DESIGN at University of Wisconsin - Stout.
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Date Created: 09/30/16
DES 308 Lighting Design Instructor: Julie Peterson Due: Wednesday, September 28, 2016 Overview with Julie Reading Notes Week 4 Winchip Chapter 2– Directional Effects of Lighting - Brightness- interaction between an illumination level and the amount of light reflected off various surfaces (reflectance) – can fix brightness by modifying color, changing direction, and or having a darker wall/floor color so the light doesn’t reflect as much. o High level of illuminance level o Can be perceived as adding value to the space or distracting o Via reflectance o Increasing foot candles level doesn’t not always improve the quality of lighting - Phototropism -- is our natural reaction to be attracted to light - Glare o A distracting high level of illuminance that can cause discomfort or be disabling Direct glare – high degree ofilluminance –bare light source , no shade Indirect glare—light source is reflecting off of some sort of surface (Veiling) Discomfort glare – difficult to see, have to change your vision path Disability glare – look away or close your eyes – need sunglasses - Foot-candles or Lux (lx)– light level or illuminance that falls on a surface o Perceived brightens is affected by the physical condition of the eyes - Reduce glare with a shade, baffle, louver, les, or can o Exterior devices – awnings or roof overhangs - Reflectance – the ratio of incident light to the light reflected from a surface or material o Demonstrates the interaction between lighting and surface qualities of an object o Examine the Angles of incidence– the actual rays of light which leave the luminaire before they strike and object/surface To change angle of light source is to change the angle of reflection (directly related) o Always consider the reflectance values of various materials and finishes - Interreflection – occurs when light is contained within a structure and is continuously reflected from its surfaces –Area is void of windows - Specular reflectance – all the falling light is reflected – glossy surface mirror like surface - Semispecular reflectance – most of the light is reflected – irregular surface honed granite surface - Diffused reflectance – light is scattered at a variety of angles – matte surface texture almost traps some of the light - Transmission – the passage of light through a material, Incidental light is able to pass through them o Direct transmission – clear glass angle doesn’t change o Diffused transmission – plastic material spreading and scattering some of light – low glare o Mixed transmission– etched glass semi scattered – not a high degree of glare - Daylight wavelengths vary according to the time of day, sky conditions, time of year, and geographic location - Chromaticity is the same as Color temperature (CCT) o Degree of red or blue in kelvin Candle = 2000k Daylight = 5000k - Color Rendering Index (CRI) o Measures how faithfully a light source reveals the color of an objects true color. (1- 100) 20 CRI is very poor 90 CRI is excellent - Direction of light source can affect quantity of light required in a space - Factors that affect glare o Individualperception o Condition of the eyes o And extreme contrast in illumination levels - Controlling the directional qualities of light sources is a key element in creating the desired atmosphere in an environment and in ensuring effective accent lighting - Illumination Zones– imaginary division of space o 1 – Immediate task (Highest levelof illumination) 3-1 o 2 – Area surrounding the task5-1 o 3 – The background (lowest levelof illumination) 10-1 o The zones can also relate it to the layered lighting approach General/Ambient; task; Focal/Accent - Illuminance – total amount of light on a surface (Foot candle) - Luminance– amount of lightthat enters your eyes after it has been reflected or transmitted.
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