"I'm used to thinking in terms of dollars per watt"
Heh, why does everything you say remind me of Hacker News today? :-)
Saw another story there over the weekend (can't recall for sure if it was recent, could have been years old) about the price of light through history. But there the measure was dollars per lux or lumen or something. IIRC, a hundred or two hundred years ago, you had to work an hour at average wage to be able to afford reading light for ten minutes; now you get a year of light for an hour of work.
Saw another story there over the weekend (can't recall for sure if it was recent, could have been years old) about the price of light through history. But there the measure was dollars per lux or lumen or something. IIRC, a hundred or two hundred years ago, you had to work an hour at average wage to be able to afford reading light for ten minutes; now you get a year of light for an hour of work.