I want to buy or build a string of Intelligent pixels in the traditional C9 appearance such as Pixabulb. I need 21" spacing (53cm) between pixels. String is to be 92 bulbs only and will be controlled by a Kulp controller. How can I obtain that spacing? (I am OK with buying a string and splicing if that is doable-- is the 3rd data wire just another 18 gauge wire? Or, I would buy custom. Detailed suggestions, please.