... Panel lighting Materials:1.Aluminium alloy PCB,good for the heat dissipation2.with high quality 3M aheasive ... ,good for the heat dissipation3.high bright SMD 3528 ... ,,Epistar,7 Lm, very modern,bright and good for the heat dissipation.4 PMMA difusser,2mm thick ... energy-efficiency and high color rendering index Best quality best price panel lighting round