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For outdoor use select cameras classed as weather resistant or mounted in a special enclosure to provide protection.Use infrared cameras for very dark conditions and/or B/W cameras with as low LUX number as possible. An ordinary colour or even monochrome camera will not give very good pictures in low light conditions although the monochrome will perform better than an equivalent colour one. Solutions available for low light conditions can include: B&W cameras with built in IR illumination, Color Day/Night cameras, additional security lighting, a separate IR illuminator in conjunction with a monochrome camera.LUX: Light levels are usually measured in lux and although full daylight can be around 10,000 lux, dusk can be as low as 1-10 lux, complete darkness is 0 lux and side street lighting can also be less than 1 lux in some cases. The closer a camera is rated to 0 lux the better its performance in low light levels. 1.3 Colour, Black and White or Day Night Cameras B&W cameras generally provide better image quality than colour ones at lower light levels. They are also usually cheaper than colour ones of equivalent specification. Colour cameras require the availability of good lighting and will generally provide better recognition capability. Day Night cameras provide the best of both worlds in an external environment. There are many different types and focal lengths of lenses; your selection will depend on light condition and distance from the camera to the monitoring object. In small rooms around 500sq. ft. cameras with standard 3.6mm lens should be OK. Keep in mind that most bullet and board type of cameras come with 3.6mm lens, the greater the distance to the monitoring object the longer focal length of the lens will be needed.Wireless CCTV cameras are easier to install but not as good under many circumstances and increase expense. There is no cabling to run from the camera to the receiver and they are ideal for temporary applications, rapid deployment or where running cable is not allowed. They are subejct to interference though. A wired camera system is always better.When planning for camera locations please take in consideration light condition, never install cameras in low light room pointing straight into the sunny area it will add glare to the picture, even if your camera has back light compensation it will not be enough.[[Category:CCTV]]