> I presume in US you have to run the 8' tubes off 220V utility
> supply? They are not very common here.

No.  I have a location, which has _only_ 120V available, which
has 3 fixtures each of which contains 2 of the 8' single pin
tubes.  They've run fine for several years (no tube changes).
I have never had to dig inside to see what type of ballast they
use (they're hanging near a 12' ceiling, i.e. difficult access).

Every case where I've worked with fluorescent lights in US
office buildings (multi-story commercial), the fixtures are
wired to the 277V supply (1 hot leg to neutral of a 3-phase
480V system).  This is for both 4' and 8' tubes.

						Lee Jones
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