Patent ID: 8807795

Claim:
An LED lighting device, at least comprising: a base made of metal; a plurality of substrates, each of the substrates having at least one electrode and at least one LED chip electrically connected with the electrode; and a plurality of insulation sheets disposed on a surface of the base, wherein each one of said plurality of substrates is disposed on a respective one of said plurality of insulation sheets with each of the insulation sheets being provided for only one substrate to be disposed thereon, wherein the insulation sheets and the substrates each satisfy correlations L 2 +2×T≧L 1 +2×Cr, W 2 +2×T≧W 1 +2×Cr, and Cr≧1.6 mm; wherein Cr is a shortest distance between the edges of the substrate and the base measured along the surface of the insulation sheet, L 1 is a length of the substrate, L 2 is a length of the insulation sheet, W 1 is a width of the substrate, W 2 is a width of the insulation sheet, and T is a thickness of the insulation sheet.