8.2.1 Test colours from standard DIN. Osram HQI-E 150 W/NDL CL
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Fig. 48: Relative luminous flux in lumen per 1000 lm and per 5 nm
In Fig. 49, the radiation output has been multiplied by the V'(λ) curve for illumination levels below 0.1 cd/m².
The diagram shows that the perceived illumination level of the metal halide lamp is far higher (in this example about three times higher) than the high-pressure sodium vapor lamp.
Illumination levels in street lighting are higher than
0.1 cd/m², resulting in a sensitivity between photopic and scotopic vision.
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