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.
1 You should provide at least 1 foot (0.3 m) of clearance for the person walking below. 2  Calculate according to the height of the ceiling. 3  For an 8-foot ceiling, a pendant lamp should hang about 12 to 20 inches (30.5 to 50.8 cm) below. 4  For each additional foot of ceiling height, add 3 inches (7.6 cm).ang a lamp over the floor. 1  Plan for roughly 84 to 96 inches (213.4 to 243.8 cm) from the bottom of the light to the floor. 2  You should provide at least 1 foot (0.3 m) of clearance for the person walking below.