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1.   The luminance of the legend,directional indicator,graphical symbols,and backgrond shall be meatrued in units of foot-lamberts(cd/m2)from circular areas not smaller than 0.030 inch(0.8mm)diameter and not larger than the area under test will permit,maintaining a minimum distance of 0.015 inch (0.4mm)between the perimeter of circular target area and the surrounding edges of the letters,directional indicators,borders,and the sign frame.Typical meaturement points for certain sign designs are shown in figure 41.1-41.6.All measruement on the background of the panel face or edgelit sign shall be within 1 inch(25.4mm)of the outer edge of any letters,directional indicater,or graphical symbols.For all sign designs,the visually bright and dimmest locations on any luminance element shall be included in the the measruements.For measurement of the combined luminance of letters and borders,a maximum 0.050-inch(1.27mm) diameter circuit target area is to be concerned upon the the junction of the letter and border.A spacing equal to at least the radins of the target area is to be maintained between the perimeter of the target area and adjacent contrasting border lines.Measruements are to be made on the candidate sign operating under each condition sprcified in 41.1.6 in a test room having no illumination other than that provided by the candidate sign.The luminance values obtained on the letters,on the background,and on the borders(if applicable)are to be separately averaged.
2. For exit sign designs not represented by Figures 41.1-41.6,and for graphical symbols,no less than two measurements shall be taken for each continuous luminous element exceeding 1 inch(25.4mm)in major dimension,at intervals not exceeding 2inches(50.8mm)linear distance between measurements.The visually brightest and dimmest locations on any luminous element shall be included in the measurements.The visually brightest and dimmest locations on any luminous element shall be included in the measurements.The contrast ratio shall be calculated(using the formula of 41.3.2)between all adjacent luminous elements that require contrst for that element to be visible.