Why does the start up color of HPS street lights change?

I notice that the HPS street lights are white when they first start working, and then they will change to yellow. لماذا?

HPS street lights rely on the sodium vapor to emit enough light, but at the beginning, the temperature is not enough for the solid sodium to vaporize. بدلاً من, when the HPS street lights are just turned on, the mercury and xenon will emit light first. And their light is white. لاحقاً, when the temperature is high enough, sodium vapor starts to emit yellow light.

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