| Word | Description |
| L.E.D. | Light emitting diode; a very efficient source of electrical lighting, typically lasting 50,000-100,000 hours. |
| Load | The amount of electric power being consumed at any given moment. Also, in an electrical circuit, any device or appliance that is using power. The load for a utility company varies greatly with time of day and to some extent with season. |
| Lumens | A measure of light intensity. |
