8 Foot 36 Watt Contractor Prime R17d 360 Degree Double or Single Ended Ballast Bypass LED Sign Tube 4000/5000/6500KIntroducing Keystone's 360 Contractor Prime LED Sign Tubes! The economical 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 with double sided signs, as the LED