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 For each additional foot of ceiling height, add 3 inches. 2  For example, for a 9-foot ceiling, the pendant should hang 15-23 inches below. 3  The pendant height can also be measured up from the surface below the light; provide a 30- to 36-inch clearance above tables and countertops.anging a Kitchen Pendant Light. While the decorative options for pendant lights are vast, installation is also a key factor to consider for pendant lighting. 1  Pendants should hang 12-20 inches below an 8-foot ceiling.