Got a lampshade from The Range and the sticker inside says
"Lamp shape picture of traditional bulb shape 60W
Lamp shape picture of CFL 12W"

This has me puzzling.
Is there something about CFLs which makes the base much hottter than a
traditional bulb?
What about the CFLs with a globe around the outside which look like
traditional lamps?
Or has someone done a dumb thing and thought "The equivalent to a 60W
filament bulb is a 12W CFL so that is the maximum size of CFL to fit"?

Struggling to find the logic here.

Cheers

Dave R

--
No plan survives contact with the enemy.
[Not even bunny]

Helmuth von Moltke the Elder

(\__/)
(='.'=)
(")_(")

On 20/11/2012 17:26, David WE Roberts wrote:
Got a lampshade from The Range and the sticker inside says
"Lamp shape picture of traditional bulb shape 60W
Lamp shape picture of CFL 12W"

This has me puzzling.
Is there something about CFLs which makes the base much hottter than a
traditional bulb?

Not necessarily hotter than a traditional bulb but hot enough to shorten
its lifetime in the wrong sort of fixture.

What about the CFLs with a globe around the outside which look like
traditional lamps?
Or has someone done a dumb thing and thought "The equivalent to a 60W
filament bulb is a 12W CFL so that is the maximum size of CFL to fit"?

Struggling to find the logic here.

The capacitors in the CFL control electronics tend to die if they get
too much above 120C. By comparison an over power incandescent will
merely set fire to the lampshade and only fail when the glass melts.

CFLs in ceiling mounted glass globes tend to overheat and die young.

--
Regards,
Martin Brown

On 20/11/2012 17:26, David WE Roberts wrote:
Got a lampshade from The Range and the sticker inside says
"Lamp shape picture of traditional bulb shape 60W
Lamp shape picture of CFL 12W"

This has me puzzling.
Is there something about CFLs which makes the base much hottter than a
traditional bulb?
What about the CFLs with a globe around the outside which look like
traditional lamps?
Or has someone done a dumb thing and thought "The equivalent to a 60W
filament bulb is a 12W CFL so that is the maximum size of CFL to fit"?

Quite likely...

Struggling to find the logic here.

unless they think that a 12W CFL is the largest that will fit physically.


--
Cheers,

John.

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In article ,
"David WE Roberts" writes:
Got a lampshade from The Range and the sticker inside says
"Lamp shape picture of traditional bulb shape 60W
Lamp shape picture of CFL 12W"

This has me puzzling.
Is there something about CFLs which makes the base much hottter than a
traditional bulb?
What about the CFLs with a globe around the outside which look like
traditional lamps?
Or has someone done a dumb thing and thought "The equivalent to a 60W
filament bulb is a 12W CFL so that is the maximum size of CFL to fit"?

Struggling to find the logic here.

An ordinary light bulb runs at up to 200C surface temperature.
The electronics of a CFL would very quickly die if they ran that
hot. The tube of a CFL is expected to run at 100C max, and the
control gear normally no higher than that.

Another factor is that you wouldn't be able to fit a 60W CFL into
many fittings designed for a 60W filament lamp.

BTW, a 60W equivalent CFL would be nearer 15W.

--
Andrew Gabriel
[email address is not usable -- followup in the newsgroup]

On Tue, 20 Nov 2012 19:51:57 +0000 (UTC),
(Andrew Gabriel) wrote:

In article ,
"David WE Roberts" writes:
Got a lampshade from The Range and the sticker inside says
"Lamp shape picture of traditional bulb shape 60W
Lamp shape picture of CFL 12W"

This has me puzzling.
Is there something about CFLs which makes the base much hottter than a
traditional bulb?
What about the CFLs with a globe around the outside which look like
traditional lamps?
Or has someone done a dumb thing and thought "The equivalent to a 60W
filament bulb is a 12W CFL so that is the maximum size of CFL to fit"?

Struggling to find the logic here.

An ordinary light bulb runs at up to 200C surface temperature.
The electronics of a CFL would very quickly die if they ran that
hot. The tube of a CFL is expected to run at 100C max, and the
control gear normally no higher than that.

Another factor is that you wouldn't be able to fit a 60W CFL into
many fittings designed for a 60W filament lamp.

BTW, a 60W equivalent CFL would be nearer 15W.

The spirel CFLs ones will often fit where the stick
ones don't shine (!)





--
Graham.
%Profound_observation%

"Andrew Gabriel" wrote in message
...
In article ,
"David WE Roberts" writes:
Got a lampshade from The Range and the sticker inside says
"Lamp shape picture of traditional bulb shape 60W
Lamp shape picture of CFL 12W"

This has me puzzling.
Is there something about CFLs which makes the base much hottter than a
traditional bulb?
What about the CFLs with a globe around the outside which look like
traditional lamps?
Or has someone done a dumb thing and thought "The equivalent to a 60W
filament bulb is a 12W CFL so that is the maximum size of CFL to fit"?

Struggling to find the logic here.

An ordinary light bulb runs at up to 200C surface temperature.
The electronics of a CFL would very quickly die if they ran that
hot. The tube of a CFL is expected to run at 100C max, and the
control gear normally no higher than that.

Another factor is that you wouldn't be able to fit a 60W CFL into
many fittings designed for a 60W filament lamp.

BTW, a 60W equivalent CFL would be nearer 15W.


These are pretty big ventilated shell globes - roughly 8" diameter.
So you should be able to get a big CFL in although it might not be
positioned centrally to the globe.
There is also plenty of airflow so heat should not be trapped.
So having noted the helpful responses, I am still not really sure why they
are only rated for a 12W CFL

Won't be having CFLs anyway because they are on dimmers :-)

--
No plan survives contact with the enemy.
[Not even bunny]

Helmuth von Moltke the Elder

(\__/)
(='.'=)
(")_(")

Its temperature seems to depend more on maker than wattage, so I suspect
that they have been mostly dumb, but maybe just on the safe side just in
case.

Brian

--
From the Sofa of Brian Gaff Reply address is active
"David WE Roberts" wrote in message
...
Got a lampshade from The Range and the sticker inside says
"Lamp shape picture of traditional bulb shape 60W
Lamp shape picture of CFL 12W"

This has me puzzling.
Is there something about CFLs which makes the base much hottter than a
traditional bulb?
What about the CFLs with a globe around the outside which look like
traditional lamps?
Or has someone done a dumb thing and thought "The equivalent to a 60W
filament bulb is a 12W CFL so that is the maximum size of CFL to fit"?

Struggling to find the logic here.

Cheers

Dave R

--
No plan survives contact with the enemy.
[Not even bunny]

Helmuth von Moltke the Elder

(\__/)
(='.'=)
(")_(")

On Tue, 20 Nov 2012 17:26:40 -0000, "David WE Roberts"
wrote:

Got a lampshade from The Range and the sticker inside says
"Lamp shape picture of traditional bulb shape 60W
Lamp shape picture of CFL 12W"

This has me puzzling.
Is there something about CFLs which makes the base much hottter than a
traditional bulb?
What about the CFLs with a globe around the outside which look like
traditional lamps?
Or has someone done a dumb thing and thought "The equivalent to a 60W
filament bulb is a 12W CFL so that is the maximum size of CFL to fit"?

Struggling to find the logic here.

What it really means is that a 60W CFL is a 12W incandescent lamp


--