[APD] American Watts different?

["Geoffrey Newman" <newmang at hotmail_com>]

Hi all. Is there any difference between American/Imperial(?) Watts and 
UK/European/Australian Watts? I ask this because some of the fluorescent 
tubes in my LFS seem to have slightly different wattages depending on where 
they were made, even though they look identical. Two 24" tubes of the same 
diameter, for example, can be either 18 watts or 20 watts.

I searched the mailing list archive and found a possible reference to my 
question.

> Further confusion results from the fact that the same 430 mA lamps
> are sometimes labeled with different wattages. In Europe, for instance, a 
> 40
> watt 4' T8 is labeled 36 watts. Same rose but different name. Some of those
> 36 watt labeled lamps are sold in N.A. as well.

Can anyone fill me in?

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