Regarding UV sleeves for flourescent lights.  These sleeves are very effective
provided they fit the lights properly and are not cracked.  Many ask about older
screens (i.e., how often should they be replaced).  Older sleeves have been
tested and found to be still effective.  What happens after years of use is the
sleeves tend to yellow (from absorbing the UV) & eventually they may crack &
craze.  The yellow is not a problem (actually helps filter out more UV) but the
cracking is.  If there are cracks - large or small - in the sleeve then UV rich
light will be coming out through the cracks.

Alternatively, one can use Verilux lights.  These lights have a very good CRI
(colour rendering index) & have a UV absorbing layer built into the lights.
Now, the one thing to keep in mind with these is that the manufacturer says that
the UV absorbing film does break down over time & become ineffective.  I believe
that they recommend replacing the lights every couple of years.  This is
important to keep in mind because the UV absorbing film stops working before the
light burns out.  Most of us in museums are pretty parsimonious and would tend
to wait for the light to burn out before it is replaced.

Susan L. Maltby, Conservator
Maltby & Associates Inc.

Quoting ed sharpe <[log in to unmask]>:

> How effective is the  uv sleving for the fluorescents?
> this is an interesting topic for discussion........
>
> ed sharpe archivist for smecc
> ----- Original Message -----
> From: "Lana Newhart" <[log in to unmask]>
> To: <[log in to unmask]>
> Sent: Wednesday, January 23, 2002 7:10 AM
> Subject: Re: lighting for small community museum
>
>
> Either remove the flourescent lighting or put UV sleeves on the bulbs.
> UV
> will destroy paper, textiles, original paints (esp. watercolor), etc.
> Sleeves can be purchased through Gaylord, University Products and
> Light
> Impression catalogs.  They also have websites.
>
> The best thing is to remove the flourescent lighting altogether and
> replace
> it with incandescent, using low watt flood lights.  Your track lighting
> can
> be upgraded to do this.  Do not illuminate objects with direct lighting
> of
> any sort as the heat from the bulbs can cause damage, including
> fading.
> Instead place the lights at a raking angle.  This way the objects are
> lit by
> indirect lighting instead of direct lighting.  This will take some
> practice
> to get it right, but it will work until you can get someone trained in
> exhibit lighting.
>
> P.S. Don't let a person w/ stage experience do your lighting.  They want
> to
> expose everything to strong lights so it can be seen.  This is
> appropriate
> for theater, but not your exhibit.
>
> Lana Newhart-Kellen
> Registrar
> Conner Prairie Museum
>
> >>> [log in to unmask] 01/17/02 04:49PM >>>
> This query is directed to museum and gallery prep installers/designers
> or
> anyone that can give suggestions. I am helping a small community gallery
> to
> upgrade its space so that it will attract exhibitions by professional
> artists. The present lighting has old fluorescent lights and some
> antiquated
> track lighting. Roplex wires run up gallery walls. Their budget is very
> low
> so they cannot afford the services of a designer. I am suggesting that
> they
> take out the old lighting, rewire and install new wiring (hiding it) in
> the
> walls. They will re-drywall and paint the walls as well. I anticipate
> that
> many of their shows will consist of 2 dimensional works, many on paper
> including photography. Sculpture and installations will probably be a
> part
> of exhibitions next year. Right now, I need a suggestion for
> appropriate
> lighting, something inexpensive please.
>
> Thanks,
>
> Lizzetta
>
> LeFalleCuratorial
> 30 Vista del Mar Court
> Oakland, CA 94611
>
>
>
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