When did Isaac Newton invent the light bulb?

I'm sorry to say that he didn't

In 1878 Joseph Wilson Swan, an English physicist and Chemist received a patent for his invention and his house was the first in the world to be lit by electric light.

See Swan's Wikipedia entry

Thomas Edison,upon seeing the British patent,or open letter, made copies and publicised his work. Swan was keen to make money from his invention and decided set up a joint venture which became the 'Ediswan' company in 1883. I am sure the name Swan would not have figured in the name unless Edison was forced to retract his claim of prior invention.

Edison did produce an efficient steam driven DC dynamo known as' Long Waisted Annies' to drive his lamps and famously lit the road out side his workshop. This the likely source of your error.