The Cree XP-E is offered in two metal core printed circuit board (MCPCB) versions: a single (1-Up: 1 LED) and triple (3-Up: 3 LEDs). The 1-Up is a single XP-E LED reflow soldered to a 20mm hexagonal (LED Star) MCPCB. The MCPCB has four large solder pads for easy solder connections. The 3-Up is three (3) XP-E LEDs reflow soldered in-series to a 20mm hexagonal MCPCB. The 3-Up MCPCB has two solder pads for connections, mounting holes for secondary carclo optics and a center hole for wires or securing the LED star to a heat sink. The XP-E LED is offered here in Far Red and Photo Red. The XP-E has been superseded by the XP-E2 but the XP-E remains the standard for Far Red and Photo Red Output.