XLamp® XHP35.2 Extreme High Power LEDs Cree LED XLamp® XHP35.2 Extreme High Power LEDs deliver low system cost through high lumen density, reliability, efficacy, and consistency. Built on Cree LED's Extreme High Power LED technology, XHP35.2 LEDs improve the lumen density, voltage characteristics, reliability, and optical performance of the XHP35 LED in the same 3.45mm x 3.45mm package.