"Ian Jackson" <ianREMOVETHISjackson@[EMAIL PROTECTED]
> wrote in message
news:vj9v7rpTqNcIFwsw@[EMAIL PROTECTED]
> In message <Wu4ck.249528$1B6.13899@[EMAIL PROTECTED]
>, Arfa Daily
> <arfa.daily@[EMAIL PROTECTED]
> writes
>>
>>"Jeff Liebermann" <jeffl@[EMAIL PROTECTED]
> wrote in message
>>news:tbf0745m65iugupkjtnnasnbe2vf777j6q@[EMAIL PROTECTED]
>>> On Sun, 6 Jul 2008 02:08:27 +0100, "Arfa Daily"
>>> <arfa.daily@[EMAIL PROTECTED]
> wrote:
>>>
>>>>Potential fire hazard, or am
>>>>I just being paranoid ? Does this need bringing to someone's attention
?
>>>
>>> You might have a point, however I find it odd that you're using a 75
>>> or 100 watt incandescent bulb in a desk lamp.
>>
>>You're mis-understanding me, I think. I'm not using a 75 or 100 watt
bulb.
>>I'm using a 60 watt bulb, as specified for the lamp, and always have
done.
>>Up until now, they have always been the 'standard' tennis ball sized
type.
>>The smaller ones that I have been buying lately, are still rated at 60
>>watts, but in my opinion, put out the *heat* of a standard-sized 100
watt
>>bulb.
>>
>>Arfa
>
> I haven't been following the thread, so apologies if this explanation
has
> been offered earlier.
>
> I'm guessing, but I reckon that smaller sized bulb may be hotter
because:
> (a) The filament may be physically smaller (squeezed in more, and coiled
> up tighter). Some parts of the filament may be obstructing the path of
the
> light from other parts. Similarly, the path for radiated heat may be
being
> obstructed. As a result, the filament may be less efficient (less light
> output, but more heat).
> (a) The glass bulb is closer to the hot filament.
> (b) The glass bulb has quite a lot less surface area available to
> dissipate the heat.
>
> What do you think?
> --
> Ian
Yes, all valid thoughts. See my further discussions of it all in my reply
below to Jim
Arfa
|
