Don't believe EVERYTHING you read.
Actually... I think there is still a couple small southern plants making incandescents... which sell mostly in Mexico. I don't follow this closely... there isn't much need. These (unknown, small name) plants... like potato chip or pretzel factories often make several "brands" which of course is merely packaging. With almost all such commodities... packaging, shipping, and distribution makes up most of the cost... and profit. PLUS... you may not pay $4 for a Dave Brand light bulb.... but slap a name brand on the same bulb with a nice package and the price is more flexible. We all know this!
The idea that the manufacture is in cahoots with oil company's and other such hoaxes are just sad. Most of us ether work for corporations NOW... or have at some time. To imply that we are somehow dishonest, conspiring, or otherwise have disregard for our fellow man is insulting and wrong. I think conspiracy theories, hoaxes, and support or opposition for various flavors of government are fine. But such beliefs are better expressed in blogs... not a HA forum.
BTW... GE was started NOT by Edison... but by investors that saw Edison going bankrupt. Edison remained extremely bitter about the take over till very late in his life when he finally visited GE headquarters (which I believe was a paid promotional visit). Edison was a brillint man with a fine creative mind. But his understanding of business was deplorable.