Longhorn Solar Offers up to a $3,000 Corporate Solar Rebate to National Instruments Employees Who Sit Through a 10-Minute Rooftop Review at the NI Home & Garden Expo AUSTIN, TX--(Marketwire - Apr 19, 2012) - In order to celebrate Earth Day, Longhorn Solar (www.longhornsolar.com) announced a special solar rebate for all National Instruments employees that live...