Installed two deck prisms over the forward part of thr engineroom- what a difference down there.No longer a dark hole with permanent lights on, we had a shaft of sunlight! The bulkhead is painted white and reflecs a lot of light. Most pleased.
Still have 2 more, but not sure where to put them. "if in doubt, piss about".
The Admiral came up with a thought- maybe one in the aft deck to light the lazarette ?