thought of this while night driving last night and seeing old cars with yellow lights and new cars with bright white lights.
In: Technology
It has to do with how controllable the light emitted is.
Old bulbs are very simple devices, they just run current through a wire that puts off light. The only way the old school bulbs have of controlling the color of the light is either a coating on the glass or by changing what material the wire is made from. These changes also change the properties of the bulbs so in the end the best option ended up being yellowish light.
Newer bulbs are much more advanced and more controllable so they can product a range of colors and even mimic natural sun light pretty well.
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