HID bulbs need a ballast in order for them to work, the bulbs here are only for replacement HID bulbs, not new install.
Here you can find replacment HID bulbs for Larsen Lights work lights, and most OEM HID bulbs can be found here for less than OEM dealer price.
Your JD or CaseIH & more, can be replaced with bulbs from Larsen Lights for less than that $200 price tag....
The H4/h & 9004/h is a combination of a 55 watt HID and a 35 watt halogen bulb. It allows the high beam to be HID, but keeps the low beam as halogen. Nice for oncomming trafic, and makes the install easy - no extra 12 volt feed needed ! (needed for Hi-Lo HID bulbs)