"I love you a ___" (pun on a cute lightbulb sticker) (4)

I believe the answer is:

watt

(Other definitions for watt that I've seen before include "Light bulb unit" , "Unit of power -- Scottish engineer, d. 1819" , "Unit of electric power" , "James - - (Scottish inventor)" , "Man of note" .)

I've seen this clue in the Universal.

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