Measuring 4 x 4 in., LED Light Guide is suited for wall and ceiling lighting, luminaires, and custom interior lighting in corporate, hospitality, and residential applications. Unit is typically edge lit from one or more sides using industry-standard LEDs, with small frame concealing LEDs in place. At 3.5 mm thick, light guide assembly provides efficiency of over 115 lm/W while producing up to 250 lm when fully powered.