SpotLight(Vector3, Single, Vector3) Constructor

public SpotLight(
	Vector3 position,
	float range,
	Vector3 direction
)

Parameters

position  Vector3

Vector3 that specifies the positions of this light

range  Single

range of this point light - range does not affect the light brightness but just disables light calculation for all pixels that are farther away

direction  Vector3

Vector3 that specifies the direction of this light

Reference