sentences:  They are suited to applications that require directional lighting such as track lighting, recessed ceiling lights, desk lamps, pendant fixtures, landscape lighting, retail display lighting, and bicycle headlights.MR lamps are designated by symbols such as "MR16" where the diameter is represented by numerals indicating units of eighths of an inch.Common sizes for general lighting are MR16 () and MR11 (), with MR20 () and MR8 () used in specialty applications.