The RAB Lighting HIDFA-27S-EX39-850-BYP is a field-adjustable 27/18/12W LED HID replacement bulb with an EX39 mogul base, delivering 1,740/2,610/3,915 lumens at 5000K and CRI80 for retrofit of high-wattage HID fixtures in commercial and industrial applications. Ballast bypass design operates on 100277V with constant current drive and a 50,000-hour rated life.