Vintage Benjamin Light Meter
Benjamin Light Meter Model B with leather case The light readings are divided into zones to indicate suggested minimum lighting levels for various workplaces and occupations. The use of the term to describe the zones is interesting. It suggests that energy costs can be reduced by keeping below the maximum level of the relevant zone. It also suggests that working productivity (and uneconomic accident avoidance) can be optimised by setting lighting levels within the specified zone for an act