PointLight(Single, Single, Single, Single) Constructor

public PointLight(
	float xPosition,
	float yPosition,
	float zPosition,
	float range = 3,402823E+38f
)

Parameters

xPosition  Single

x component of the light position

yPosition  Single

y component of the light position

zPosition  Single

z component of the light position

range  Single  (Optional)

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

Reference