Mitochondrial disease is a group of disorders caused by dysfunctional mitochondria, the organelles that generate energy for the cell.itochondrial diseases are sometimes (about 15% of the time) caused by mutations in the mitochondrial DNA that affect mitochondrial function.
1 Surface-mounted light â the finished housing is exposed, not flush with surface. 2  Chandelier. 3  Pendant light â suspended from the ceiling with a chain or pipe.  Sconce â provide up or down lights; can be used to illuminate artwork, architectural details; commonly used in hallways or as an alternative to overhead lighting.
Keep height in mind. How the pendant light will be used will also determine how high it should be hung. For an entryway, seven feet above the floor is recommended. If you're using a pendant in a dining area, it's generally best to suspend the light at least 30 above the table. Similarly, pendants used for a kitchen island area should be 30-40 above the counter.