I am attempting to install some experimental lighting in the ship. The lighting will be ambient so there is no flare emitter from its brick. I decided to use the red cieling crossbars seen here:

The white bands on them are where the lights will be located.
We have not had lighting before for two reasons: one, the structural design of the ship's interior has only 2 plates of thickness between decks (meaning we simply do not have the space or the convenience of installing lights directly into the ceiling), and two, the ship is simply far too massive for conventional lighting to work properly, as it would max out the schedule limit and jam up other events such as relays in the ship.
When I say "conventional lighting", I am referring to the popular lighting methods often used by spacebuilders such as myself today. It consists of three plate layers stacked on top of each other, in the below pattern.
A
BBB
CCC
"A" represents the brick that provides the light source, and is usually the only one of its kind for the single light unit. It supports the entire lighting unit as well. "B" represents the "Light panels", upside-down print plates that have no print and have the glow fx. It gives the light a more realistic feel and makes it look cooler. And to top it all off, there's "C", the decorative layer. It can consist of a frame of glass for a stylish safe look, a special wedge plate frame for light units that look curved, or even nothing at all.
Like I mentioned before, the floor/ceiling thickness is only 2 plates thick, which is not enough for incorporation of conventional lights therefore. It would require at least 5 plates of thickness for conventional lights to work.