APEX HIR2 Connectors Aptiv (formerly Delphi) APEX HIR2 Connectors offer a headlight-bulb connector solution that mates halogen-infrared variety bulbs. HIR2 connectors are built around the high-performance APEX 2.8 terminal system, which provides excellent heat energy conductivity. The silver-plated, high-temperature terminals allow for operating temperatures of up to 190°C. APEX HIR2 connectors and terminals are tested to 150°C ambient with a powered lamp for realistic operating conditions.