Light is part of electromagnetic spectrum

Luminance is the amount of light coming from a light source (lumens, candela)

Illumination is the amount of light passing a point in space (lumens per square meter, foot-candle)

Reflectance is a fraction=luminance/illuminance

Color Rendering Index (CRI)
Cool White Fluorescent=62
High Pressure Sodium=21

Light Spectrum
Energy Efficiency

UV from Fluorescents

Illumination levels need to be higher where precise work is done

Low angle illumination
Luminance ratio 3:1 adjacent ,10:1 any place
   Discomfort Glare
   Disability Glare
Reduce Glare by
   Make light source bigger
   Move light source to peripheral vision


Send mail to CompanyWebmaster with questions or comments about this web site.
Copyright 2005 CompanyLongName
Last modified: 10/04/05