Product Specs, Voltage 3.6, Base BIPIN, Shape T1.25, Overall Length (mm) 25.4, 360-HAL, Manufacturer: Copeland, 3.6 Volt Gold Contacts Retinoscope Optec 360 - 360-HAL Replacement Light Bulb - Equipment to Lamp - 360-HAL - Manufacturer: Copeland - 3.6 Volt Gold Contacts