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You'd not say "a 2 watts light bulb" though, would you?

Of course not, which is why my example, the entirety of which is delimited with quote marks, does not contain an adjectival clause. You seem to have lost track of the topic of discussion, which was the claim that there was language in an official document proscribing the use of pluralizations of units. No such documentation has been found. Now you seem to think that I was asserting that one must always pluralize units or some such thing. I've made no such assertion, but if you want to continue along those lines, I recommend a visit to the Argument Clinic.