I like what I read on their web site, but I wi***hey had a picture of the detectors. I assume the IR transmitter and detectors are placed on either side of the track. My problem is that my hidden staging has about one inch of between track centers. I doubt that this leaves me enough room to install these. The photocells are placed between the ties (?), but they need light to work. I guess I could install a lamp overhead though. Anyone have any experience with these?