Exterior lighting experts agree that the most durable, waterproof splices to connect landscape lighting fixtures are those which are permanently crimped and encased inside of sealant-filled, heat-shrink tubing.   This video is produced by the manufacturer of Lighting Shrink, and explains the safety, reliability, and durability of these premium connectors.  Leading industry installers have given these connectors strong positive reviews and use these crimps exclusively on outdoor lighting projects.  With the harsh climate and outdoor conditions of Hilton Head Island and the Carolina coast, this form of permanent connection is highly recommended above other materials such as wire nuts ("twist-ons") and grease-filled tubes tubes.