[ldoughty]

It also rules out people who use any form of light in their household... including candles.

But I do believe the author was jokingly referencing landlords adding generic catch-all clauses without understanding the issue, and understood it went to such lengths, and found that funny. (I did)

[wongarsu]

You don't even need a light. The tenant themselves would emit lots of infrared radiation. Not to mention the black body radiation from any other items on the property that are hotter than absolute zero.

[giantg2]

Or people themselves (IR).