In this study, we investigated the high stress fringe characterization ability of filament lamp, LED bulb and fluorescent lamp as light source in photoelasticity experiment. Photoelasticity sample that was made of polycarbonate was put in circle polariscope and experienced pure bending to achieve 24 fringes order in the up and down edges. The polariscope was illuminated by filament lamp, LED bulb and fluorescent lamp separately to produce color digital experiment images. In each experiment picture, one line perpendicular to bending neutral axis in middle of compressed zone was extracted by MATLAB software. Then the red, green and blue spectrums of this line were plot versus picture pixel and fringe order to compare the high stress fringe characterization ability. The analysis result shows that among three light sources, fluorescent lamp provides better fringe characterization ability up to 24 fringes. The result helps to select light source for high fringe order photoelasticity experiment properly.
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