LED indirect lighting 1.0.6mm steel housing, rust free 8-10years under normal application. 2.With PMMA opal diffuser LED indirect lightingDescription1.LED ... Luminous flux:1000lm/1100lm;6 4 years warranty for the LED tubes7.0.6mm steel sheet housing,rust and oil removed ... and soft light,Glare-free and optimal for modern office lighting.8.Main application:Hotel,shopping mall,show room,bank,supermarket ...