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ERIC Number: ED030259
Record Type: RIE
Publication Date: 1963-Apr
Pages: 27
Abstractor: N/A
Reference Count: N/A
A Recommended Engineering Application of the Method for Evaluating the Visual Significance of Reflected Glare.
Blackwell, H. Richard
Illuminating Engineering, v58 n4 p217-243 Apr 63
An application method for evaluating the visual significance of reflected glare is described, based upon a number of decisions with respect to the relative importance of various aspects of visual performance. A standardized procedure for evaluating the overall effectiveness of lighting from photometric data on materials or installations is needed and this paper contains such a method. Specific luminaire layouts were made for each of ten rooms of various ratios. Contrast factors were computed for each of 20 luminaire materials when used in each room, with two combinations of reflectances of floor, ceiling and walls. These factors represent the values of task contrasts for each of four tasks at each of three viewing angles for a given luminaire material, divided by corresponding task contrasts for Lambert luminaires utilized under the same conditions. The observer was considered seated beneath the luminaires, which is the location of most serious reflected glare. Formulas and tables are given. (RH)
Illuminating Engineering, 345 East 47th Street, New York, N.Y. 10017
Publication Type: N/A
Education Level: N/A
Audience: N/A
Language: N/A
Sponsor: N/A
Authoring Institution: N/A
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