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.
Pendant lights are commonly hung over kitchen islands providing adequate task lighting while also providing an opportunity to enhance the kitchen design. When hanging a pendant light over a kitchen island, the pendant should be hung 30 to 40 inches above the island surface.Because kitchen islands are where family and guests gather, you should consider their interactions at the island when deciding on how low to hang your pendant.hen hanging pendant fixtures in a corridor, the height of your ceiling will give you a good idea of the type of fixture you should purchase. If you have 8 foot ceilings, choose a pendant light where the overall length falls between 12 to 16 inches.