One thing I have observed about old light bulbs is that they would make your house absolutely warm in the Summer time & make your central air conditioner have to work overtime.
I never realised it back then, however ever since they changed the way light bulbs are made I have observed a large difference in how tough our central heating & air conditioner has to work just to cool our house with quality a/c, but now, I can set our control device at a comfy seventy many degrees & the house will be cool as ever no matter how warm it is at night outside; But back before they changed how light bulbs were made, this was not the case. I would have to set our control device to around seventy more than two just to get the control device to study seventy multiple. I always thought maybe it was something faulty in our central heating & air conditioner. But this was not the case at all. It was just those darn light bulbs making things too warm in the house at night. The light bulbs were sort of working as a light heating system in a way. So this is where the problem laid. In the Wintertide though it was beneficial because the central heating system would not have to work overtime at night when the lights were on because of the extra heat coming from the light bulb. I am cheerful they made this change to how they are made, because our central heating & air conditioner is in perfect working order!