[Tujuan penelitian ini adalah mengetahui pengaruh intensitas dan lama penyinarandengan LED curing unit terhadap kekuatan tarik diametral resin kompositmikrohibrida. Enam puluh tiga spesimen dari tiga merk resin kompositmikrohibrida; Polofil Supra, Filtek Z250, dan Solare X, dibagi ke dalam duakelompok perlakuan dan satu kelompok kontrol. Kelompok perlakuandipolimerisasi menggunakan LED curing unit Flashmax P3 selama satu dan tigadetik sesuai instruksi pabrik. Kelompok kontrol dipolimerisasi menggunakanLedmax 450 dengan lama penyinaran sesuai instruksi pabrik resin komposit. Hasilanalisa statistik tidak menunjukkan perbedaan bermakna. Intensitas cahaya yangtinggi dengan lama penyinaran yang pendek tidak mempengaruhi kekuatan tarikdiametral resin komposit mikrohibrida., The aim of this study was to evaluate the influence of light intensity and curingtime of the newest LED curing unit on diametral tensile strength of microhybridcomposite resin. Sixty three specimens from three brands; Polofil Supra, FiltekZ250, and Solare X, were divided into two test groups and one control group. Thetest groups were polymerized by LED curing unit Flashmax P3 for one and threeseconds based on the manufacturer's instruction. The control group waspolymerized by Ledmax 450 with curing time based on composite resinmanufacturer's instruction. The result was statistically insignificant. Higher lightintensity and shorter curing time did not influence the diametral tensile strength ofmicrohybrid composite resin.]