LDC

A Line Drop Compensator is utilized to provide constant voltage at the load.

LDD

Luminaire Dirt Depreciation Factor

Lead

The condition where the current precedes in time with respect to the voltage in an ac circuit (for example, a capacitive load).

Lead Acid (Battery)

Term used in conjunction with a cell or battery that utilizes lead and lead peroxide as the active plate materials in a diluted electrolyte solution of sulfuric acid and water. The nominal cell voltage is 2.1 volts.