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Nature of Operations	6 Months Ended
Nature of Operations	Jun. 30, 2019
Disclosure Text Block [Abstract]
Nature of Operations	NATURE OF OPERATIONS Energy Focus, Inc. and its subsidiary engage in the design, development, manufacturing, marketing and sale of energy-efficient lighting systems. We develop, market and sell high quality energy-efficient light-emitting diode (“LED”) lighting products in the commercial and military markets. Our mission is to enable our customers to run their facilities with greater energy efficiency, productivity, and wellness through advanced LED retrofit solutions. Our goal is to be the retrofit technology and market leader for the most demanding applications where performance, quality and health really matter. We specialize in LED lighting retrofit by replacing fluorescent lamps in institutional buildings and high-intensity discharge (“HID”) lighting in low-bay and high-bay applications with our innovative, high-quality commercial and military tubular LED (“TLED”) and other LED products. Product development is a key focus for us. Our product development team is dedicated to developing and designing leading-edge technology LED lighting products based upon the voice of the customer.