Random triggers from ambient light will depend on how much IR is in the light source. Cool LED and fluorescent likely won't be a problem. incandescent maybe, sunlight for sure as some fellow club members who used my circuit found out when we setup at a local fairgrounds. Those detectors are very fast, much faster than 60 hz. Being able to mount the detector on the flange will depend on how much is the way. Usually the cast on leaf springs are the problem. On my last install I had to install the sensor below the frame.
Pete
