For F150 model years 2004-14, the MKIII series has two bulb units that consists of a total of 8 CREE XHP LED's. 2 on one side and 2 on the other side for each bulb unit. One on each side lights for low, all light for high. 

For F150 model years 2015-18, the MKIII series has 4 bulb units (2 for low beam, 2 for high beam) that consists of a total of 8 CREE XHP LED's. 1 on one side and 1 on the other side for each bulb unit. All of the LEDs on a bulb unit light for either low or high beam respectively. 

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