In article ,
dpb wrote:
wrote:
On Dec 11, 12:01 pm, dpb wrote:
wrote:

...

That's a big assumption. The fact is that we use light to see.
Well, I can assert that in my case (the only one that actually matters
to me ) it's not an assumption at all. I see fine using the same
wattage-rated bulb in 130V version as the 120V and as long as that is so
it's a win if they last longer...

Then why don't you use a 60W in stead of a 100W, for example?

Because the difference in a 60W @120V wouldn't be enough for a location
that has a 100W in it, either. The substitution is as earlier
stated--simply 130V of whatever I'd use 120V in that location and I'm
good to go.

A 100 W 130V bulb operated at 120V has just about the same output as a 75W 120V
bulb. It's a wash on electricity cost, balanced against the cost difference
for the 130V bulbs, vs 120V ones. Plus the "convenience factor" of less
frequent bulb replacement. Drawback: the 130V bulbs give off a "yellower"
light than the 120V ones -- one may, or may not, notice it.

A 60W 120V bulb has somewhat more output than a 75W 130V bulb at 120V.
The 120v bulb is the _clear_ winner in this case. bulb is less expensive,
gives off more light, and uses less electricity. The -only- advantage to
the 130V bulb is less-frequent replacement.

At lower wattages (60W@130/40W@120 and 40W@130/25W@120), the cost advantage
also goes to the rated 120V bulb. Again, the -only- advantage to the 130V
bulb is less-frequent replacement.