Figure 6-26.—Isofootcandle diagrams.ISOFOOTCANDLE DIAGRAMSThe isofootcandle diagrams show what the lightlevel will be at any given point. The dimensions for thediagram are based on the mounting height (MH) of thefloodlight. The aiming point (p) is also based on themounting height. Figure 6-27 provides a diagram formounting heights of MH x 0.5, MH x 1, and MH x 2.The grid pattern is also based on the mountingheight. The grid line values left and right give thedistance to either side of the floodlight. The values upthe side show the distance in line with the aimingdirection of the floodlight. The number 3, for instance,represents 3 x 40, or 120, feet from a 40-foot mountingheight.Each isofootcandle line shows where thefootcandle level is the same. These lines are identifiedby a letter, which is used with the initial footcandle (fc)table. The footcandle values between isofootcandlelines do not change more than 2 to 1. That makes itpossible to approximate the level between lines.6-23