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Phosphorescent microspheres are 90% spherical and appear to be off-white under ordinary daylight or
regular room illumination. However, when the lights are turned off
these phosphorescent particles exhibit phosphorescent yellow-green
after-glow.Intensity according to DIN 67510-1:800 mcd/m2 at 1 minute, 180 mcd/m2 at 5 minutes, 90 mcd/m2 at 10 minutes, 12 mcd/m2 at 1 hour, 5 mcd/m2 at 2 hours