How Many Historical Novelists Does It Take to Change a Light Bulb?

How many historical novelists does it take to change a light bulb? A shocking 21, it turns out:

One to screw in the light bulb.

One to complain that the new light bulb is too dim for reading.

One to complain that the new light bulb is too bright for reading.

One to say that it's just right.

One to ask about how homes were illuminated in the (say) fourteenth century.

One to supply a list of references.

One to say that the list of references supplied is all wrong, and that he or she has better referen...