Ahh see this is where it gets a bit messy I guess. The question originted not so much by the need for a 20 A lighting circuit ( garage was an example) but the fact that a small garden shed exists with a 20A circuit supplied to it to feed a couple of 20A T-slot GFI's. It is now requested that a light be installed in the shed and according to code its not "In the dwelling" so I was thinking legally I can supply the fixture from this circuit without having to change the breaker in the panel to a 15A rated device as well as the GFI's.
Also I am curious, would rule 30-104(a) not apply to portable lighting such as a table lamp or a trouble light? Just seems that if I plug in a trouble light to a normal 15 A receptacle its code compliant yet if I plug it into my T-slot 20A receptacles in my kitchen its a violation is it not?
A.D
