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.
Hanging Around. Ideally, the bottom rims of your pendant lights should hang about 30 inches above the surface of your kitchen island counter. An alternate way to determine the proper height is to measure from the floor upward.ith this method, the bottom rims of the lighting fixtures should be positioned 60 to 66 inches above the floor. If the ceilings in your kitchen are higher than 8 feet, light from the fixtures will be dispersed more evenly if you increase the height of the pendant lights 3 inches for every extra foot of ceiling height.