On Fri, 11 Dec 2009 08:44:19 -0600, dpb wrote:

wrote:
...

less power (though less than expected using your calculations) will
make the bulb less efficient (lumens per watt), costing you money too.
...

There's the same fallacy assumption that Lew made as well -- _ONLY_ if
one is requiring the same or more lumens will there be a higher energy
cost to obtain them--as told Lew, for household lighting, a 100W bulb is
a 100W bulb and one gets the light one gets (at least that's what I do).
It's good enough and bulbs last.

Sure it's not much for an ordinary 100W bulb so the convenience of not
having to replace them is a factor but there's no economic penalty
associated w/ gaining that (again, assuming one doesn't go from 75W _to_
100W per bulb).


From GE 2006 large lamp catalog

100 A 130V 100 watts 750Hrs 1680 lumens
100A 130V@120V 89 watts 1950Hrs 1275 lumens GE shows rated watts as
89 at 120V.

Depends whether your more concerned about light level or life of the
lamp. Since there are so many better options these days it seems
pointles to even use them.

Mike M