Well Ted, the barn seemed much bigger than most home darkrooms so the light leaks may be more easily dissipated and be effectively reduced on the inverse square principle. Secondly it made me wonder whether we obsess too much over tiny leaks especially where the leak isn't in a direct path to the paper. A tiny leak under a door which is well below the level and not in a direct line to the easel or the trays may well be inconsequential

pentaxuser