Analysis:
Daylighting:
  • The lux values taken during the day time were on average to be 1,480. M.E.E.B. shows that a comfortable luminance level for reading related tasks to be between the lux levels of 1,500 to 2,500 see Illuminance Chart
    This shows that at the time of our data collection, the lux values are at a desirable level for the tasks intended. If the direct exposure becomes visually unbearable and the luminance factor increases to produce uncomfortable levels of glare, the user controls (blinds) may be implemented to adjust the luminous environment to comfortable levels.
Electric Lighting:
  • The lux values taken during the evening were on average to be 110. These values are extremely low and create visual discomfort when studying. Due to this inadequate lighting, the studying surfaces produce low visual contrast and may be harmful to one's vision. The Illuminating Engineering Society (I.E.S.) handbook standards show that by estimating the volumeteric space one can easily calculate the proper number of luminaires needed in order to adequately illuminate the study surfaces. According to I.E.S. the state of Oregon has a maximum power density allowance of 1.5 watts per square foot, given the ceiling height is over 15 feet. To jump further into the analysis portion of our reading room case study take a look at our I.E.S. specifications worksheet. Learn more about I.E.S. and I.E.S.N.A.