... can apply to War Industry,family lighting,factory,office,bank,market.hotel egc..Also they ... be used for 100000 hoursSpeed of light-Leonard seconds,light is without delay,and can return ... No inert Basically. High of lumious efficacy-Light spectrum almost all focused on visible spectrum frequency ... ,the electric shock protection is G III,gold light,low calorific power,can be touch safelyEnvironment ...