2nd October 2019


Why does a sodium vapor street light look yellow?

They produce light around 589nm which is in the yellow region of the spectrum. HPS are not as efficient as LPS but they produce light in a more varied light spectrum. So they look whiter than LPS, although not as white as fluorescent, halogen or LED lights. Thus, the Sodium vapor lamp emits a bright yellow light.

Similarly, you may ask, what color is a mercury vapor light?

"Color corrected" mercury bulbs overcome this problem with a phosphor on the inside of the outer bulb that emits white light. They offer better color rendition than the more efficient high or low-pressure sodium vapor lamps.

What are sodium vapor lights used for?

There are two kinds of sodium lights: Low Pressure (LPS) and High Pressure (HPS). These lamps are mostly used for street lighting as well as industrial uses. The lamp works by creating an electric arc through vaporized sodium metal. Other materials and gases are used to help start the lamp or control its color.

What color does radon emit?

This sets off cascades of photons. But radon isn't done. When it becomes solid at -71 degrees, it changes. The glow it gives off turns yellow, and then, as it cools, dark red.
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