Richard van der Oost writes:
I recently reached out to all our Blendergrid users, asking who would be interested to contribute some articles to our site while being stuck at home, to earn some side income.
Awe Kayode was interested and he wrote this how-to article about IES lighting in Blender. Covering the use of the IES node that has been a part of Cycles since Blender 2.80.