Lightbulb unit (4)

I think it could be either:

Which length description are you looking for?:

watt

'lightbulb unit' is the definition.
(I've seen this in another clue)

This is the entire clue.

(Other definitions for watt that I've seen before include "Light bulb unit" , "James - - (Scottish inventor)" , "man of power?" , "Unit of electricity" , "Engineer, coined the term horsepower, d. 1819" .)

I've seen this clue in the LA Times, The Washington Post and the Universal.

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