35 75 150 350 Question 2. A workplace has a reflactance of 75% for a task that is performed by a 38-year old male worker. The task includes visual elements involving very small size objects. Speed and accuracy requirements are judged to be important. What is the recommended illumination level for TABLE 25.3 Recommended Interior Illumination Levels for Various Activities and Work Situatio Category Areas and Activities Illumination Level Public areas with dark surroundings Where general lighting in area is required Where visual tasks are performed occasionally D Where visual tasks of high contrast and/or large size are performed E Where visual tasks of medium contrast and/or 750 small size are performed F Where visual tasks of low contrast and/or very 1,500 small size are performed Where visual tasks of low contrast and/or very 3,500 small size are performed over extended periods TABLE 25.4 Adjustments to Recommended Illumination Levels: Weighting Factors for Task and Worker Characteristics, and Adjustment Multiplier (a) (b) Adjustment to Weighting Factors Algebraic Sum Illumination Level Under 40 40-55 Over 55 -2 or -3 Multiply by 0.7 Speed and accuracy Unimportant Important Critical -1 or 0 or +1 Multiply by 1.0 required Reflectance of task 70-100% 3070% 0-30% +2 or +3 Multiply by 1.3 background 7 cm 0 +1 Worker age