This is the current (latest and greatest) K5600 flicker free ballast for use with all of their 200w HMI heads. It is a universal power supply with AC and DC input capability. It is in excellent condition, with some Sharpie marker writing on it (I can attempt to remove or you can). The best new price is right around $1600. I don't think I've ever seen another available second hand, by itself. Asking $1300 PayPal'd and shipped US 48.
It is this exact model:
http://dl.dropbox.com/u/9081612/K5600_200W_Ballast_ACDC.jpg
It is this exact model:
http://dl.dropbox.com/u/9081612/K5600_200W_Ballast_ACDC.jpg