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Light Fixtures in a Ceiling Revit mep

Face-hosted lighting fixture families are most commonly used because they can be attached to ceilings in your model or ceilings within a linked file in your model. You can use face-hosted fixtures to represent recessed, surface, and pendant-mounted lights.
Cutting holes in the Ceiling
Lighting fixture families can be made to cut the ceiling when they are placed. If you are attaching them to a ceiling that is in a linked file, the fixture will not cut the ceiling. This has no effect on lighting calculations and affects only the appearance of the model. If your architect is using your lighting model for a
reflected ceiling plan, ceiling grid lines will be visible through lighting fixtures that cross them.
The default hosting for a face-hosted family is to a vertical face. To place lighting fixtures onto a ceiling, you need to select the Place On Face option, located on the Placement panel of the contextual tab that appears when placing a lighting fixture family. Recessed lighting fixture families should have an insertion point at one corner of the fixture. This will allow you to align
the fixture to the ceiling grid on placement. If the family you are using does not have an insertion point at a corner, place the fixture on the ceiling and use the Move or Align tool to line it up with the grid.
Using the Align tool is great for lining up your fixtures with ceiling grid lines, but it is important that you do not lock the alignment. Face-hosted families will not move with the grid lines when changes are made to the ceiling. Locking the alignment will cause constraint errors when the link is updated after the grid has moved. Either way, the lighting fixtures will stay attached to the ceiling if its elevation changes.
Once you have placed lighting fixtures onto a ceiling, you can copy them where needed. It is important to copy only the fixtures within the ceiling by which they are hosted. If you attempt to copy a face-hosted fixture from one ceiling to another that has a different elevation, you may receive a warning that the new instance of the fixture lies outside its host, or that the fixture will
simply remain at the elevation of the original. This will cause the fixture to be in the model without a host or to be above the ceiling, which can result in an inaccurate model. By not being hosted by the ceiling, the fixture will not react to any changes in the ceiling elevation. By being above the ceiling, lighting calculations will be inaccurate because the fixture will not be inside the space.
The Create Similar command is an easy way to use the same type of fixture family from one ceiling to another. Use this command instead of Copy to duplicate a fixture family in another location. When you use this method, you will be required to set the hosting option to Place On Face before picking the location of the new fixture. Use the Pick New tool on the Workplane panel of the Modify | Lighting Fixtures contextual tab to move a lighting fixture from one ceiling to another.
Face-hosted lighting fixture families can be used in areas where a ceiling does not exist.
Another choice for placement is to use the Place On Work Plane option. This will associate your fixture to a defined plane in the model. Because of the mounting behavior of face-hosted families, it is very important to draw your reference planes in the correct direction. Drawing a reference plane from right to left will orient the plane properly for overhead lighting fixtures.
Drawing from left to right will cause your lighting fixture families to be upside down in the model, as shown in Figure 12.9.
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