"Phil Allison" wrote in message
...

"James Sweet" wrote in message

The only difference between 120V and 240V CFLs is the configuration of
the rectifier and filter capacitor(s) on the input.


** Where do fools like Sweet get this ******** from ??

120 volt and 240 volt CFLs drive circuits mostly have the very similar
topology.

The tubes for the latter simply run at half the current of the former.

See for 120 volt CFLs.

http://www.repairfaq.org/sam/cflamp1.pdf

http://www.repairfaq.org/sam/cflamp2.pdf

See for 240 volt CFLs.

http://www.pavouk.org/hw/lamp/en_index.html


All 14 shown use a bridge rectifier at the AC input.





Interesting, those are different than most of the ones I've torn apart which
had a voltage doubler with a pair of identical filter caps, these are mostly
older though. Either way the tube current is determined by characteristics
of the tube and most of a given diameter are about the same. Input voltage
does not determine tube current, the design of the ballast does, in the case
of the first one, the inductor L2 is primarily responsible for limiting lamp
current to something reasonable.

Getting rid of that crossposting crap, makes me wonder if any newsreaders
can warn when crossposting so I don't have to remember to check.