No horse hair in light bulbs. Today's incandescent light bulbs feature a tungsten filament.
Since the filament must be heated to very high temperatures in order to glow, tungsten is the only fairly inexpensive metal with a high enough melting point to get the job done.
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I don't actually know but I very much doubt it. Horse hair is not a very good conductor of electricity.
Those wanting softer, diffused light use frosted light bulbs. Clear bulbs give light that is brighter and suitable for everyday applications.
Any natural light bulbs that use incandescent lighting will work well, and give off a rounder light than the "sterile white" lighting of normal bulbs.
It might be the energy saving bulbs.
you can use an oingion but not a carrot
There is no reason to use magnesium in light bulbs. Magnesium readily and easily catches fire and burns -- white hot.