By Author Unknown
A whole reference on CCTV expertise
Gives useful suggestion at the right makes use of of CCTV to most sensible guard opposed to crime
Contains greater than a hundred pictures of the main sleek apparatus available.
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Extra info for CCTV Surveillance. Video Practices and Technology
The halogen chemical cycle permits the use of more compact bulbs than those of tungsten filament lamps of comparable ratings and permits increasing either lamp life or lumen output and color temperature to values significantly above those of conventional tungsten filament lamps.
During nighttime or dusk operation, the camera system may see moonlight a n d / o r starlight and reflected light from artificial illumination. The light level varies from a maximum of 10,000 fc (from natural bright sunlight) to a minimum of 1 fc (from artificial lamplight at night), giving a ratio of 10,000 to 1. For indoor applications, tube and solid-state cameras (such as CCDs) usually have sufficient sensitivity and dynamic range to produce a good image and can operate with manual-iris lenses.
For covert security applications, some lamps are fitted with a visible-light-blocking filter so that only invisible IR radiation illuminates the scene. A significant advance in tungsten lamp development is the use of a halogen element (iodine or bromine) in the lamp's quartz envelope, with the lamp operating in what is called the tungsten-halogen cycle. This operation increases a lamp's rated life significantly even though it operates at a high temperature and light output. Incandescent filament lamps are available with power ratings from a fraction of a watt to 10 kilowatts.