Lighting Design

IES Recommendations for Mitigating Glare

Craig DiLouie November 2, 2010

	IES RP-1-04, Recommended Practice for Office Lighting	IES RP-3-00, Recommended Practice for Lighting Education Facilities	IES RP-7-01, Recommended Practice for Lighting Industrial Facilities
General glare (excessive luminances or luminance contrasts in field of view)		1. Avoid high-brightness contrasts in field of view 2. Increase brightness of background to very bright objects 3. Raise the glare source
Direct glare (caused by high luminances or unshielded light sources)	1. Reduce relative brightness of luminaires and windows 2. Shield view of bright sources 3. Increase brightness of background to very bright objects	1. Low-brightness luminaires 2. Control window luminances (e.g., shades, louvers)	1. Reduce the luminance or area of the glare source (e.g., luminaire shielding) 2. Raise the glare source further above line of sight 3. Increase ambient illuminance
Reflected glare (caused by high luminance sources or veiling reflections)	1. Locate luminaires or shield windows to avoid problems with ted glossy surfaces 2. Large area, low-luminance luminaires or indirect lighting 3. Ant-reflection coatings or filters for computer screens	1. Place illuminance on both sides of task 2. Special luminaire optical designs 3. For VDT applications, use monitor with diffuse reflecting screen and dark test on bright background	On VDTs: 1. Total cutoff of light source images 2. Change VDT orientation and position 3. Improved-contrast screens 4. Block view of light sources in offending zone
Disability glare (veiling luminance covers retina)			1. Reduce illuminance on eyes 2. Raise glare source
Discomfort glare (luminous image has much higher luminance than balance in field of view)			1. Size, luminance and source/eye/task geometry are factors

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