Although household light bulbs come from the factory labelled, good luck reading that label in near darkness on a stage while you’re in a hurry because there’s a burn out and the gaffer’s yelling at you on the walkie because they need a replacement Right. Now.
So, we label the bulb with a marker so it’s easier to see. Obviously, this particular bulb is a 60 watt.
Oh, and that whole thing about no more tungsten light bulbs? We can still get them.