We will sell it in set, include-ing 2 bulbs, 2 ballasts, 1 cable and package. This HID light is special for color temperature of only 3,000K. It is an attractive gold color light. Specifications: 1) Power: 35W 2) Voltage: 12V or 24V 3) Efficiency: 95% 4) High lumination: 3,200 Lm 5) Long life: 10 times longer than ordinary halogen lamps, about 3,000 - 5,000 hours 6) Operating ambient temperature range: -20 - +85°C 7) Low voltage protection: when voltage of the battery is less than 9V, ballast will stop working to avoid HID bulb exhausting electric energy 8) Over-voltage protection: when voltage of the battery is more than 16V for trouble of power supply system and battery, ballast will stop working to prevent high voltage from burning bulb 9) Waterproof: up to DIN400500 legal standard 10) Anti-dust: up to SAE J575 legal standard 11) Shockproof: up to DIN40056 legal standard 12) If large quantity, models can be: H1, H3, H3C, H4 (single bulb), H4 (dual bulb), H4 (Hi/Lo), H7, H8, H9, H10, H11, 9004 (single bulb) , 9004 (dual bulb), 9004 (Hi/Lo), 9005, 9006, 9007 (single bulb), 9007 (dual bulb), 9007 (Hi/Lo), D2S, D2R, D2C