An LED chip for use in an LED chip array forming a continuous array of LEDs. The LED chip comprises an array of LEDs on a substrate. LEDs in a row of the array are longitudinally offset from corresponding LEDs in another row. Adjacent LEDs in each row of the array are separated by a longitudinal pitch. At least part of an end face of the substrate is angled with respect to a transverse axis of the LED chip such that the LED chip is positionable adjacent another LED chip to maintain the longitudinal pitch between adjacent LEDs on different chips.