[rollei_list] Re: OT: Light bulb for slide viewer
- From: Eric Goldstein <egoldste@xxxxxxxxx>
- To: rollei_list@xxxxxxxxxxxxx
- Date: Wed, 18 Aug 2010 16:48:42 -0400
James, you are forgetting the premise of my comment... that ideally
you want more light in these viewers. I know that the halogen
replacements I use in my 50s/60s stereo viewers are substantially
brighter than the original lamps, but they generate more heat, and
only some viewers can handle them.
I'd be interested in knowing of any incandescent lamp that produces
more light and less heat with the same wattage.
Eric Goldstein
--
On Wed, Aug 18, 2010 at 4:38 PM, James Richard Tyrer <tyrerj@xxxxxxx> wrote:
> On 08/18/10 12:57, Eric Goldstein wrote:
>>
>> They run the filament at a higher temperature and produce less heat?
>
> Yes. The higher the temperature of a black body, the higher the percentage
> of the radiant energy that is emitted as light. So, less radiant energy is
> emitted as heat. The total radiant energy is determined by the Wattage, not
> the temperature. I am not sure if the higher temperature is achieved by
> using a smaller filament or if it is due to the insulating qualities of the
> noble gas fill.
>
> I also note that light of a higher color temperature appears brighter than a
> lower one.
>
> --
>
> James Tyrer
>
> Linux (mostly) From Scratch
>
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