We have detached the light fixture that was blocking the movement of the east moveable cleanroom enclosure in B111B.

The wires that suspend these lights are attached to metal brackets that are screwed into the light casing. Once the screws are removed, the brackets can be removed by prying them out of the plastic casing with a screwdriver. This releases the light, apart from the electrical connection to the ceiling. The electrical wire from the ceiling connects to the wiring inside the light with wire nuts, and cannot easily be detached.  

We released the light fixture from its suspension wires, and rested it on top of the moveable cleanroom. We then moved the cleanroom to adjoin the other one. The electrical wire is long enough to allow some movement of the cleanroom with the light resting on top of it, but we should not try moving the cleanroom more than ~30 cm or so without supporting the light.