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Wavelength m Nanometers

Spectral energy dianbutionot 400-Watt MetalarcC lamp

Wavelength m Nanometers

Spectral energy dianbutionot 400-Watt MetalarcC lamp

Figure 39. Spectral energy distribution of 400-W Metalarc clear lamp.

Low-pressure sodium lamps have been widely used in Europe for many years for the same applications. There are some installations in the US. This is the highest efficacy commercial lamp available (approximately 160 to 180 lumens per watt).

The spectral energy distribution for this lamp reveals that it is monochromatic; in effect, this is a yellow-only lamp. No degree of filtering will permit proper color rendition. These light sources are easily recognized (the source is quite large and relatively low brightness, particularly compared to the high-pressure sodium).

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