On top of that, fourth - IES light profiles are rather poorly supported by Blender.
Third issue - lots of pre-made IES light profiles significantly increase render times as usually they're not properly optimized for 3D applications. A light imported from one manufacturer may operate on completely different units than light coming from the other source. A few lamp manufacturing companies share various IES profiles available through their websites but that leads us to the second issue - lack of standardization. First - you need to import them to every 3D application as IES light profiles which have to be created in external software. IES lights are most widely used in architectural visualizations but by default they have some usability flaws.
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