Home
FAQ
About Us
Contact		 Footprint Home Security and Spy Cameras

Call 1300 852 400 for Expert Advice, Tips and Suggestions

Join our specials & info newsletter:

Security Camera
Specialists for all your
Home and Business Needs

View Cart, Check out, Finished Shopping

Security Products

ASIAL

Comparison Shopping Australia - Certified by Getprice  
Footprint Security Store Information, Rating and Reviews at MyShopping.com.au

We accept:
Mastercard Logo
Visa Logo
Amex Logo
Paypal Logo

We proudly support
Bravehearts Logo

We honour
Seniors Card
Call for details

 

 

 

Home >> Free expert Advice

Glossary - L

A   B   C   D   E   F   G   H   I   J   K   L   M   N   O   P   Q   R   S   T   U   V   W   X   Y   Z  

Lambert
Lambert-ian source or surface. A surface is referred to as a "Lambert" radiator or reflector (depending if its a primary or secondary source of light) if it is a perfectly diffusing surface.
LASER
This is an abbreviation for Light Amplification by Stimulated Emission of Radiation. A laser produces a very strong and coherent light of a single frequency.
LED
Light Emitting Diode. A semiconductor that produces light when a certain low voltage is applied to it in one direction.
Lens
An optical device for focusing a desired scene onto the imaging device in a CCTV camera.
Level
When relating to a video signal it refers to the video level in Volts. In CCTV optics, it refers to the auto iris level of setting of the electronics that processes the video signal in order to open or close the iris.
Line-locked
In CCTV, this usually refers to a multiple of cameras being powered by a common alternative current(AC) source (either 24VAC or 240VAC) and consequently have field frequencies locked to the same AC source frequency (50Hz in CCIR systems and 60Hz in EIA systems).
Lumen
A light intensity produced by the luminosity of 1 candela in one radian of a solid angle.
Luminance
Means brightness, but in TV refers to the video signal information about the scene brightness
Lux
Light unit for measuring illumination. It is defined as the illumination of a surface when luminous flux of 1 lumen falls on an area of 1mē. It is also known as lumen per square metre, or, metre-candelas.

 

Jump to:
Spy cameras & Security cameras | Wireless spy cams | Wireless Spy Camera Packages | Outdoor Spy Camera
Long Range Outdoor Spy Camera | Mini Spy Camera | Wireless Accessories
Wired Security Cameras | Outdoor Infrared Cameras | Dome Cameras | Standard Camera | DVR & Camera Packages
Wireless transmitter/receiver | Digital Video Recorders | Standalone 4 Channel DVR | Colour cameras
Camera Lenses | Manual Iris Lenses | Auto Iris Lenses | Security products
Camera Brackets & Housings | Security spy cameras | Wired Accessories
Free Expert Advice | Specials | Clients | Privacy Policy | About Us | Contact Us
Useful Links | FAQ | Glossary | Security News | Testimonials | Policies | Sitemap | View Cart | Downloads

 

Copyright (c) 2004-2010 (Colourstory Pty Ltd T/a Footprint Security ABN 84 122 563 651)
PO Box 1218, Runaway Bay, Queensland 4216, Australia