Basically it's what I call Edison bulbs. I mentioned earlier in this thread how much of a douche Edison was. He stole a bunch of inventors ideas and ran to the patent office and he got the credit and the money.
He bribed local children to steal neighborhood pets so he would conduct electrical tests on them (the animals not the kids). He held public demos and electrocuted the animals to discredit Tesla's AC (alternate current) system and make his ideas look dangerous. This killed the animals bc they were so small, but the same system on a human did not harm. You may remember Tesla walking around in a ball of electricity using his AC system? Also our electricity we use now is based off Tesla's idea.
Lastly Edison did not invent the light bulb, so surely they should not be called Edison bulbs! Tesla didn't either, but just like him so much more, so I personally call them Tesla bulbs.
This comic puts it in a funny context, but I've read the same book the comic based this cartoon off of. It's much more entertaining than the book.
http://theoatmeal.com/comics/tesla