What is the distinction between high pressure sodium lamps used in Type M and Type N fixtures?

The distinction between high-pressure sodium lamps used in Type M and Type N fixtures primarily lies in the number of lamps. Type M fixtures are typically designed to accommodate a single high-pressure sodium lamp, whereas Type N fixtures are engineered to support multiple lamps, enhancing overall illumination for larger areas.

This distinction is significant in applications where varying lighting demands exist. For instance, in residential or smaller commercial areas, one lamp may suffice, making Type M fixtures more appropriate. In contrast, Type N fixtures, with their capacity for multiple lamps, are better suited for larger spaces that require increased luminance.

While wattage, color temperature, and shape of fixtures may also play a role in the general characteristics of the lamps and fixtures, these factors do not fundamentally define the differences between Type M and Type N in the context of lamp quantity. Thus, focusing on the number of lamps gives a clearer understanding of the practical applications and designs of these fixtures.