The selection of STS HID Bulbs is only limited to your imagination. HID Bulbs are charged by a gas technology providing better lighting. Cruise in style with STS HID Bulbs. HID Bulbs are extremely efficient and provide better coverage. Care for your Caddy with STS HID Bulbs. New HID Bulbs last up to 10x times longer than halogen bulbs. HID Bulbs save you money and provide more safety by increasing your visibility.