After walking the facility & assessing the existing inefficient lighting we decided to change the existing (250) 400W metal halide high bay fixtures with (162) 150W LED high bay fixtures & (88) 200W LED high bay fixtures in the production warehouse. We chose to install our GI industrial high bays with 110-degree optics & an aluminum reflector to cast all available light downwards. We also replaced (50) 70W 2-lamp 4ft T8 fluorescent hanging fixtures with (50) 48W LED-hanging fixtures on the wet end of the board line. This is where production of the gypsum board begins so it was very important to have efficient lighting in this area. We were able to complete the install in 2 weeks without disrupting gypsum production.