In it, he follows the manufacture of Duro-Test 100-watt light bulbs through all the stages of their assembly as neck, filament and envelope are brought together in strangely beautiful twentieth ...

Standard 60- and 40-watt bulbs are the last to be phased out, though remaining stock can be sold; 75-watt bulbs faded away in 2012 and 100-watt bulbs ... $125 dollars per bulb in energy costs ...