Our super bright Mini Lights have commercial grade LED's. These strings have non-removable LED's; this eliminates failures from loose, broken, or removed bulbs. These commercial grade LED St. Patrick's lights are very durable long lasting and extremely energy efficient. Each string is full wave rectified, which eliminates any flickering making these LED lights brighter than ordinary LED mini Lights. Each LED uses a patented concave design making these LED viewable from all angles.  Energy Star qualified and UL Listed for indoor and outdoor use.