Considering the lighting needs of factories and large public areas, we specially made larger light bulbs, with brightness much higher than these small civilian light bulbs." Seeing Carlo's satisfied expression, Graham was visibly more at ease, continuing to introduce other types of light bulbs to Carlo.
Hearing that there were even larger light bulbs, Carlo became more curious and smiled, saying, "Larger light bulbs? How about the lifespan of such light bulbs?"
While instructing people to install larger light bulbs for experiments, Graham answered Carlo's question, "Due to current technological limitations, the lifespan of these larger light bulbs is far less than that of the smaller ones.
After conducting over a hundred experiments, we finally determined that the lifespan of these large carbon filament light bulbs is only around 120 to 150 hours, and they cannot be used intensively.
