Re: Compulsory low-energy light-bulbs


"Cynic" <cynic_999@xxxxxxxxxxx> wrote in message
news:to6iv25pql52c3m9mvrrumpng35bnolmqo@xxxxxxxxxx
On Thu, 15 Mar 2007 08:21:39 -0000, "M.I.5¾"
<no.one@xxxxxxxxxxxxxxxxxxxxxx> wrote:

These are designed for use in numerous countries that use mains voltages
from 100 volts (Japan) to 120 volts (US). That fluorescent ballast is
presumably designed for 110-120 volt operation (but why mark it 117
volts
and not 115 volts is beyond me - but what's a couple of volts between
friends).

I suspect that the rvoltage range is 110V to 125V. If that is the
case, 117V would be around the mid-way point, allowing the spec to be
117V +/- 8V

That would make sense - if their was a place in the world that had 125
volt
supplies. But otherwise, a good point.

There doesn't have to be. I have power supplies that specify an input
voltage between 90V - 260V. AFAIAA there are no places with either
90V supplies or 260V supplies.


Yes but these are portable switch mode supplies that just happen to have a
very wide operating range. They frequently get used in environments where
the supply is not regular mains supplies. Having said that, the specified
frequency range rarely reflects the true operating range of the supply. It
did occur to me afterwards that it is possible that if that fluorescent
ballast's manufacturer's data is consulted, that it may specify an operating
voltage range of 115-120 volts, of which 117 is halfway, if rounded down.


.

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