[alt-photo] Re: UV Point Light Source

[Tomas Sobota]

Alberto,

After switching the lamp on, you have to wait a couple of minutes before
using it. After this time (more or less) you see the light change color from
the usual yellow to a greenish hue. That is the visual signal that the lamp
has started emitting UV. This change is quite fast and you notice it easily.

The lamp gets hot, but not extremely since a great part of the 300W
dissipate as non-caloric UV. More than UV tubes, to be sure. But with a
separation of 50cm or so from the print, the heat does not reach it
noticeably. Not even in summer, from my experience.

When you finish the exposure, you have to wait until the lamp cools down
before turning it on again.

Tom

On Mon, May 23, 2011 at 8:24 AM, Alberto Novo <alt.list at albertonovo.it>wrote:

> Philippe Berger wrote:
>
>> I use also a Osram UltraVitalux for my Carbon Transfer. It is perfect, no
>> problem
>>
>
> Isn't it too hot, and the light increasing for the first minute or so after
> the switching on?
> Alberto
> www.grupponamias.com
> www.alternativephotography.com/wp/photographers/rodolfo-namias-group
>
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