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IES files describe how light from a lamp is distributed in a room. This data is provided by many manufacturers so that lighting designers can realistically simulate how a project will look when a specific light source is used. 3D artists …Welcome to IES, Leaders in HVACWelcome to IES. We specialise in providing comprehensive heating, ventilation and air conditioning as well as HVAC solutions to the commercial and industrial sectors, including to airports, hotels, restaurants, casinos, banks, hospitals, …IES Communications, LLC | Low-Voltage | United StatesMEET IES. OUR STORY. Starting in 1984 as a structured cabling systems provider, Federal Communications Group (FCG) was founded in Tempe, Arizona. FCG was acquired in 1999. Between 1999 and 2011, IES consisted of a group of electrical contractors. IES'' corporate vision was to achieve synergies associated with several other industry consolidations.