Description Echo Round 3.5 blends the benefits of T5 and T5HO fluorescent lamps with a compact housing, integral ballast and efficient optical design. A wide variety of mounting, shielding and lensing options are available to provide the versatility to solve numerous lighting application challenges. Features Extruded aluminum housing.Thermally protected ballast.Cast aluminum end caps.Stem mount versions include (2) 5/8" steel mounting stems.Stainless steel external fasteners.Field adjustable housing.Locks in desired orientation.95% reflective aluminum reflector.Thermoset polyester powder coat finish standard.Integral electronic ballast.Class "A" sound rated ballast.UL listed (US and Canada) for damp location. (Not recommended for exterior use)Meets NEC 410.73 double-ended, fluorescent lamp ballast disconnect requirements.