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Contact SupplierWe are offering place of origin: jiangsu, china (mainland) brand name: kinglux model number: kl-hb107-87-60 material: glass, high borosilicate glass 3.3 usage: optical structure: concave-convex shape: free-form surface refractive index: 1.474 light transmittance: 94%, after coating can reach 100% working temperature: from -50degree to 550degree color: transparent tensile strength: 40- 120nmm - 2 beam angle: 60±10 degree suitable led power: 20w-100w cob led, using led light-emitting area within 75mm application: 20w-200w led high bay light, headlight,led factory lamp,flashlights certificates: iso9001rohssgs.