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Letter L

Lead-acid Batteries

Lead-acid batteries have a very low energy-to-weight ratio but due to their ability to supply large surge currents have an excellent power-to-weight ratio.

Also see Alkaline Battery | Lithium Battery | Zinc Chloride Battery

Lithium Battery

Lithium batteries use a lithium compound as an anode and can produce up to twice the voltage of a traditional zinc chloride or alkaline battery.

Also see Alkaline Battery | Lead Acid Battery | Zinc Chloride Battery

Longlife Battery

A battery which has a longer lifespan than standard 9V battery units.

LPG - Liquefied Petroleum Gas

LPG is most commonly found as bottled gas used as fuel for heating appliances. The 2 most widely used types of LPG are mixes of propane and butane.


Lumens is the measurement of light emitted from a lamp.


A light fixture complete with a light source or lamp.


The amount of light measured on a level surface i.e., the further away a luminaire, the less lux is present on a surface.