9 Foot 47 Watt R17d 360 Degree Double Ended Ballast ByPass LED Sign Tube Gen 2Factory Replacement: 9 Foot 47 Watt R17d 360 Degree Double or Single Ended Ballast Bypass LED Sign Tube 4000 5000 6500K Introducing Keystone's 360 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!