Product updated on 2021-02-04, SBx Parts - SBX:HID:BALLAST35W, Ballast for 35 watt HID offroad lights. These are ONLY for the 4 inch round offroad lights, these are not for an HID conversion kit., Replacement Ballast for 4" round offroad lights., This HID driving light puts out massive amounts of light at a low price making it the best value for your money. Designed specifically for off road usage it has a rugged housing and replaceable bulb and ballast.