Arrived on site and met with Jan to troubleshoot an exterior commercial lighting issue. He informed me the first corner light was coming on intermittently and the back wall light (1st light along back wall) was not illuminating at all. I inspected the first reported fixture and found the photocell was aimed directly at the building. This was causing the sensor to pick up less light and illuminate unnecessarily. I redirected the photocell to aim away from the building. I went to the second light and tested. It came on immediately after some adjustment. When I covered the photocell as designed, it the commercial lighting illuminated as it should. I brought Jan outside to see this light illuminating properly, explained the issues we found and the repairs made to correct them. Cleaned up.