Very generous of the owner.
When we first bought this building, one section was used as warehouse from the old plant. Two people would bring material over first thing in the AM. turn all the lights on and leave them on all day; 9 to 10 hours and went back to the other building. A couple of bulbs burned out so the shipper asked me to get a couple of new bulbs.
She handed me a bulb and it was 1,000 watts. Electric at the time was
15¢ a kW. Not only was the bulb $110 to replace, it costs $36+ a day to light an empty building with 30 fixtures. Once explained, they turned on only a couple of needed lights and the overhead was less.We since replaced those 1000 watt fixtures with 200 watt fluorescent.