...she turned the light on. The switch is on the outside of the door....
yup, move the switch to the inside but also put it inside a covered receptacle so you can't accidentally flip it on. Have this in my darkroom and closing the cover after switching off the lights is automatic for me now. Mine is similar to this http://www.homedepot.ca/product/gfci-receptacle-cover-vertical-white/906884


