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L

LCD LIQUID CRYSTAL DISPLAY
A Display that relies on an external source of illumination. Most commonly the displays appear with a grey/green background and with black digits or text. The display can be illuminated in one of two ways. Backlit with LED's or other light source shining through the display or Reflective with ambient light passing through the display and being reflected back from a partially reflective rear plate.

LCL
Abbreviation for Light Center Length. This measurement (in mm) is the distance between the top of the lamp base and the optical center of the filament. This measurement is critical as it ensures that for a particular lantern, the filament is at exactly the correct position for maximum light output and efficiency. Many different lamp types exist, but there are far fewer lamp-base types, meaning it's possible to insert the wrong lamp into a lantern very easily, resulting in poor output and efficiency.

LD / L.D.
Lighting Designer.

LE MAITRE
UK based manufacturer of pyrotechnic devices (Pyroflash brand name), smoke machines and other theater effects.

LECTRIFLEX
Multipin connector for carrying multiple lighting circuits down a multicore cable.

LED / L.E.D.

• Light Emitting Diode. LED technology is becoming extremely useful in the areas of architectural lighting and video walls. LED light sources are becoming brighter and cheaper. They are extremely efficient, and give off very little heat, making them ideal for display or architectural work. LED video walls are in use all over the world - they are more efficient and lighter in weight than projection alternatives.
• A self illuminating display used in many of Ryger's controllers , Available in red, yellow, green and more rarely blue.

LEE
UK based manufacturer of lighting gels.

LEKO
A type of ellipsoidal profile spot, much used in the USA. Contraction of the original manufacturers names.