>> Isn't the plural Henries? Like Volt -> Volts?
>=20
> If Volts and Amps and Coulombs and Farads and Newtons and ...=20
> were correct, then Henries might be too, although arguably it would
> be Henrys

Lux ?

Lumen ?

You'd have to say that the unavoidable common useage would be to
pluralise with an 's' something that is a quantity with identifiable units

"How many volt ?" just doesn't sound right

Rules like this are arbitrary anyway. People make them, not the electrons
--=20
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