Measuring light levels

August 2002 CCTV, Surveillance & Remote Monitoring

Using a light meter will give one the lighting level; the following are the light levels recommended by the lighting industry:

* Indoor:

Warehouse: 20-75 lux

Emergency stairs: 30-75 lux

Corridors and stairs: 75-200 lux

Shops: 75-300 lux

Offices and reception areas: 300-500 lux

Bank and offices: 200-1000 lux

Assembly lines: 300-1000 lux

* Outdoor

Full sunlight: 10 000-1 000 000 lux

Overcast day: 100-10 000 lux

Twilight: 1-10 lux

Full moon: 0,1-1 lux

Overcast night: 0,01-0,1 lux

Starlight, clear: 0,001-0,01 lux

The amount of light on the site should always be taken into consideration when choosing the right cameras for illumination in a given area. In well-lit areas a medium performance camera will usually suffice.

However, on a site where lighting is below 1,0 lux, a high-performance camera will normally be required.

For more information: Reditron, 011 887 1546, jhb@reditron.co.za



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