IESAn IES light is the lighting information representing the real-world lighting values for specific light fixtures. For more information, visit http://www.ies.org/lighting/. is a file format that contains the description of a light’s properties. It simulates realistic architectural lights based on real-world lights sold by vendors. You can obtain IES profiles online - many light manufacturers provide free IES files to download.
Figure 1: Various IES light profiles shaping the light distribution
You can add IES profiles to an existing light source from the Shader Editor. Connect a Float Image Tex node to a Blackbody emission's Distribution pin to load the IES file into the Float Image Tex node.
Figure 2: Using the Float Image Tex node to add an IES profile to a light source