Blender Guru - Did you know that Cycles now allows for IES lighting? Download the add-on by Lockal here: http://blenderartists.org/forum/showthread.php?276063-IES-Lamps-to-Cycles It's great for realistic architectural lighting! | Facebook
80k free IES profiles for architectural light • Blender 3D Architect
Download over 90,000 free IES lighting files from IES Library | CG Channel
Photometric Light — AMD Radeon ProRender
IES profile | High Definition RP | 10.0.0-preview.27