Bulb units

I think it could be either:

Which length description are you looking for?:

watts

'bulb units' is the definition.
(I've seen this in another clue)

This is all the clue.

(Other definitions for watts that I've seen before include "Sculptor" , "G. F. -, Eng. artist; power units" , "rates of working" , "Power units (lighting)" , "Rolling Stones drummer?" .)

I've seen this clue in the King Feature Syndicate.

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