I have often heard people refer to having dimmer racks in their schools. In our school, we save Rosco IPS dimmer bars on our electrics. I'm curious, which system of dimming control is more common in schools and facilities? Also, when a facility has dimmer racks, how is the output of each dimmer run to the electrics and the catwalk to power the luminaries? Is it basically a bunch of really long extension cords, or does it work differently?