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 Thermally protected ballast.Ballasts minimum start temperature is 0° F.Extruded aluminum housing.Cast aluminum end caps.Stainless steel external fasteners.Field adjustable housing.95% reflective aluminum reflector.Thermoset polyester powder coat finish standard.Integral electronic ballast.Class "A" sound rated ballast.UL listed (US and Canada) for Wet LocationsFluorescent versions utilize a gasketed snap-tight acrylic lens.Aluminum cover fits over a standard 4" octagonal junction box.Meets NEC 410.73 double-ended, fluorescent lamp ballast disconnect requirements.