Polytrauma Rehabilitation Center Design Guide - Office of ...

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Polytrauma Rehabilitation Center Design Guide May, 2008 c. Avoid allowing direct sunshine into the building interior in such a way that it may cause visual discomfort or visual disability. Assess the design for all possible sun penetration angles. d. Provide daylight sensitive controls for the electric lighting so that it will be dimmed or turned off when not needed. 4. Artificial Lighting When measuring the effectiveness of artificial light, there are generally two scales by which this is done: the Color Rendering Index (CRI) and the Correlated Color Temperature (CCT). The CRI indicates how precisely a specific source of light can show an object in relationship to its true color. The CCT describes the degree to which a color appears warm (reddish), neutral or cool (bluish) and is measured in degrees Kelvin (K). The following illustrations demonstrate the effects of artificial lighting on a plane of interest and the various solutions available: 2-11 Office of Construction & Facilities Management
Polytrauma Rehabilitation Center Design Guide May, 2008 Color Temperature Applications 2500 Bulk industrial and security lighting 2700-3000 Low light levels (10fc); General residential lighting, hotels, fine dining and family restaurants, theme parks 2950-3500 Display lighting in retail and galleries; feature lighting 3500-4100 General lighting in offices, schools, stores, industry, medicine; display lighting; sports fighting 4100-5000 Special-application lighting where color discrimination is very important (uncommon for general lighting) 5000-7500 Special-application lighting where color discrimination is critical (uncommon for general lighting) Minimum Lamp CRI Applications 50 No critical industrial, storage and security lighting 50-70 Industrial and general illumination where color is important. 70-79 Most office, retail, school, healthcare and recreational spaces. 80-89 Retail, work and residential spaces where color quality is important 90-100 Retail and work spaces where color rendering is critical Table 2.1 2.3.4. Contrast and Glare Color Classification of Light Sources The quality of lighting can be judged through two primary characteristics: contrast and glare. Contrast is necessary for good visual perception. It is also possible to produce excessive contrast, which impedes good visual response. Therefore, luminaires and light fixtures need some type of shielding device to prevent a direct view of the lamps. Glare is usually associated with brightness differences or with reflected light. It is not recommended that luminaires be placed on the ceiling unless properly shielded with a lens, diffuser or shading device. Windows should generally be located to the patient’s side to produce good quality task light without veiling reflections. 2.3.5. Physiological and Psychological Benefits Interior design for PRC facilities present a wide range of color problems due to the different needs of patients, visitors, doctors, nurses and other staff and the varied nature 2-12 Office of Construction & Facilities Management
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