Amerlux Avista is an advanced LED light engine for retrofitting traditional and post top luminaires or for new construction. Unique with a completely sealed LED optical chamber, Avista offers cutting-edge optics and extraordinary output. Simple to install with adjustable height levels, Avista allows you to position the light where you want it for maximum performance. A super-efficient, economical energy saver, Avista takes exterior LED lighting to the next level.