Re: i1Pro weirdness & fix
Re: i1Pro weirdness & fix
- Subject: Re: i1Pro weirdness & fix
- From: Graeme Gill <email@hidden>
- Date: Tue, 23 Feb 2016 12:02:27 +1100
Ernst Dinkla wrote:
> Could there be also some inherent balance in that lamp where the thinner
> filament burns with a higher output and the tungsten condensation on the
> lamp envelop dampens that output again?
Sorry, I don't know the details of QH lamp physics in enough detail to
really know. I do wonder though, that if a portion of the filament is
getting hot enough to be a measurable contributor to the visible output,
that it would also be very close to burning out.
> Till heat brings the tungsten back
> to the filament.
The reason that QH lamps burn out eventually, is that the tungsten is
not evenly re-distributed when it condenses back. So eventually the
filament develops thin spots. I would guess this depends on the filament
geometry to a large degree. Typically this is a coil or coiled coil,
so I guess this doesn't help.
> You mentioned that the lamp is glued into its socket, is
> the window where the light is coming from quite small? The glue keeping the
> lamp isolated to bring it on temperature fast or the other way around
> creating a heat sink?
Hard to say. The lamp itself is much like any small "grain of wheat" lamp,
a rounded end cylinder. The dome of the lamp is exposed, while the body
is glued into the support. See <http://www.argyllcms.com/i1pro_lamp.jpg>.
The Spectrolino is quite similar, although about 2/3 the size.
Graeme Gill.
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