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Have you ever seen an Edison light bulb? (I have.)
Here’s a web page dedicated to one of the most famous ones:
http://www.centennialbulb.org/
They’re long lasting, but inefficient.
That’s why people looked for a better/brighter/more efficient filament:
http://americanhistory.si.edu/lighting/bios/coolidge.htm
"I remember this circumstance very well because of the excitement and surprise and incredulity which he manifested at the time. He asked me over and over again what it was. I told him that it was pure tungsten wire, only to have his question repeated again and again."
-- William D. Coolidge recounting a conversation with German lamp inventor Fritz Blau, 1909
-- William D. Coolidge recounting a conversation with German lamp inventor Fritz Blau, 1909
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