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Supply and install ACCESSIBLE EXIT Series SND surface mount LED exit signs. The lamp housing and canopy shall be of extruded aluminum, graphic lenses shall be optical grade acrylic with diamond polished edges. Lens size shall be 21" x 7 1/2" and EXIT letters and Accessible Graphic shall be 6" in height. Lighting uniformity shall be better than 4:1 when measured over any illuminated area and average brightness will exceed 6 ft Lambert (21 Cd/m2). Life expectancy of the LEDs shall be in excess of 20 years. Power consumption shall be less than 1/2 watt per face. The power supply and charger shall be an isolated digital type with regulated current and voltage output to the lamp load and batteries (emergency models). AC supply shall be universal 120/277 VAC input via two-wire feed.