DescriptionUpgrade your vehicle's lighting from D1S or D3S setups to the more desirable D2S standard with these essential igniter adapters. Featuring integrated Siemens igniters, they reliably power D2/D4 bulbs with over 23KV, ensuring optimal performance in any climate. These adapters are compatible with most OEM D1S/D3S ballasts and D2S/D4S HID bulbs, providing a seamless solution for enhanced headlight performance.Part Number: BL290Features IGNITER: 1x D1/D3 to D2/D4 Adapter Warranty: 1 Year Notes Pinned: Specially for D1S ballasts and bulbs, please note that if you have a D3S based headlight setup, they will still work - but you will also need a set of D1/D3 cables (since they're universal) Compatible: With virtually all OEM D1S/D3S ballasts and D2S or D4S HID bulbs. The input on the igniter is the same as the standard input on the side of D1/D3 bulb you're looking to replace. (Note that: D1 ballasts can only power D2 bulbs, and D3 ballasts can only power D4 bulbs!)