117 Inch 25 Watt R17d 180 Degree Double Ended Ballast ByPass LED Sign Tube Gen 2Introducing Keystone's 180 LED Sign Tubes! The Sign Hero series from Keystone is the perfect solution for retrofits or new sign installations. There is no need for an external driver or ballast, making it the fastest way to upgrade a sign to LED. Maintenance professionals can install these LED sign tubes in five minutes or less! These tubes are available in an array of lengths and work ONLY with single sided signs, as the LED output is projected from