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Dimensions & weightSize:8x8x2 3/8 inches (198x198x60mm)Weight:5.9lbs (2.7kg)Physical properties modulus of rupture21.8 n/mm2 (=222 kgf/cm2) (astm c 67)Compressive strength2.74 n/mm2 (=27.9 kgf/cm2) (astm c 67)Breaking load:34,888 n (=3,558 kgf) (astm c 67)Operating emperature: -25oc ~ 60ocOperating time 12 hours minimumonset point 150 - 350 luxCharging time 1(sunny) to 8(cloudy and rainy) h/SReference standardsAastm c902: Standard specification for pedestrian and light traffic paving brickAiesna dg-5-1994: Recommended lighting for walkways and class 1 bikewaysWalkway class avg.Maintained illuminance levels in lux(horizontal levels)-commercial 10-intermediate 5-residential 2Easy installation anywhere-sunlight, rain or shade-horizontal or vertical placementWide operating temperature- -40c~75cAutomatic on/offNo electric leakageSemi-permanent life-unlimited charge/discharge cycle-no degradation of energy torage no performance water-proof structureNon-contaminating materials