[Nhcoll-l] [EXT]Re: [EXTERN] Re: LED lights in collections

Wed Jan 29 16:01:48 EST 2025

Thanks Luci for the response and extra info!

Dirk, I would think it's the fats, not peptides that cause the stickiness,
as when polymers like oils and fats degrade, they tend to become sticky and
slimy. IR could be a contributor here as well, so the three of them sped up
the reactions of decay not just in the colors but in everything.

Thanks everyone for this amazing light convo!
Mariana

*Mariana Di Giacomo, PhD*
*Natural History Conservator, Yale Peabody Museum*
Associate Editor, Collection Forum, SPNHC

El mié, 29 ene 2025 a las 12:25, Dirk Neumann (<d.neumann at leibniz-lib.de>)
escribió:

> interesting that it turned sticky!
> Has anyone ideas? Any secondary reaction/break-up of the residual peptides
> in the skin?
>
>
>
>
> Am 29.01.2025 um 16:00 schrieb Luci Cipera:
>
> Hello,
>
>
>
> Yes, this is a photo from the Canadian Museum of Nature.  It is no longer
> on our website.
>
>
>
> These three frogs, as well as other natural history materials (fur,
> feathers, shells, etc.), were exposed to sunlight thought a window for a
> period of time.   The frogs (fluid specimens) had the most dramatic changes
> and that is why the photo has been used to demonstrate light damage.
>
>
>
>    - The frog on the left was kept under aluminum foil – no UV or visible
>    light.
>    - The frog in the middle was covered with a UV filter - exposed to
>    visible light.
>    - The frog on the right was exposed to full sunlight – visible light
>    and UV.
>
> The frog kept in the dark retained its colour.  The frog exposed to only
> visible light faded much slower than the one exposed to full sunlight.  It
> retains some colour. While the frog exposed to full sunlight faded faster
> and lost more colour overall.  The other observation is that the frog
> exposed to UV and visible light showed signs of breaking down of the
> tissue.  The surface of the frog was sticky to touch.
>
>
>
> Visible light will cause light damage, but much slower than if also
> exposed to UV radiation.
>
>
>
> Another resource from the Canadian Conservation Institute:  The Light
> Damage calculator.
>
> Light Damage Calculator - Canada.ca
> <https://app.pch.gc.ca/application/cdl-ldc/description-about.app?lang=en>
>
> This tool really helps demonstrate how any amount of UV significantly
> accelerates the damage to materials.  However, visible light will also
> cause light damage, but at a much slower rate.  That is why it is important
> to control light levels for exhibitions, but also collections area.
> Something like making sure lights turned off at night makes a big
> difference.
>
>
>
> Luci
>
>
>
> *Luci Cipera*
>
> Conservator, Collection Services and Information Management
>
> Conservatrice-restauratrice, Service des collections et gestion de
> l’information
>
> *Canadian Museum of Nature / Mus**é**e canadien de la nature*
>
> 613-364-4079
>
> lcipera at nature.ca
>
>
>
>
>
>
>
> *From:* Nhcoll-l <nhcoll-l-bounces at mailman.yale.edu>
> <nhcoll-l-bounces at mailman.yale.edu> *On Behalf Of *Mariana Di Giacomo
> *Sent:* January 29, 2025 7:54 AM
> *To:* Shoobs, Nate <shoobs.1 at osu.edu> <shoobs.1 at osu.edu>
> *Cc:* NHCOLL-new <nhcoll-l at mailman.yale.edu> <nhcoll-l at mailman.yale.edu>
> *Subject:* [EXT]Re: [Nhcoll-l] [EXTERN] Re: LED lights in collections
>
>
>
> COURRIEL EXTERNE. Ne cliquez sur aucun lien ou pièce jointe à moins que
> vous ne connaissiez l'expéditeur.
>
> EXTERNAL EMAIL. Do not click any links or attachments unless you know the
> sender.
>
> Dear Nate,
>
>
>
> It is quite possible that the LEDs are causing the damage because light
> damage is not only caused by UV but also by visible light (and IR but
> through other mechanisms).
>
>
>
> Here's a good resource from the Canadian Conservation Institute about
> light as an agent if deterioration:
> https://www.canada.ca/en/conservation-institute/services/agents-deterioration/light.html
>
>
>
> And I'm also including an image I took from the Internet a while back but
> cannot find again (it has a Canadian Museum of Nature watermark, but I
> cannot find the original source anymore). It is a great example of both UV
> (right) and visible light (middle) affecting museum collections. Maybe some
> of our Canadian colleagues can provide the resource.
>
>
>
> Hope it helps,
>
> Mariana
>
>
>
> Mariana Di Giacomo, PhD
> Natural History Conservator, Yale Peabody Museum
> Associate Editor, Collection Forum, SPNHC
>
>
>
> On Tue, Jan 28, 2025, 15:16 Shoobs, Nate <shoobs.1 at osu.edu> wrote:
>
> Question on this subject – our museum uses Phillips MASTER LEDtube
> InstantFit HF T8 bulbs in old fluorescent light ballasts. The building was
> converted from ancient 80’s GE fluorescent tubes (that emitted a
> significant amount of UV light) back in 2018.
>
>
>
> I’ve noticed that posters I’ve put on the wall near these new lights have
> faded significantly in the last 4 years, despite our collections spaces
> having no other light sources and no windows. It could be that the poster
> inks are not light fast, but this thread made me wonder if the LED bulbs
> are doing the damage.
>
>
>
> I can’t find a spec sheet that quantifies the amount of UV or IR emitted
> by these bulbs, but I see that Phillips’ marketing language claims that the
> bulb “Emits virtually no UV rays or IR”.
>
>
>
> Anyone know whether these bulbs actually emit UV that will damage
> materials over time?
>
>
>
> Best,
>
> Nate
>
>
>
> --
>
> [image: The Ohio State University]*Nathaniel F. Shoobs*
> Curator of MollusksCollege of Arts & Sciences Dept. of Evolution, Ecology, and Organismal Biology
> Museum of Biological Diversity, 1315 Kinnear Rd, Columbus, OH 43212 <https://www.google.com/maps/search/1315+Kinnear+Rd,+Columbus,+OH+43212?entry=gmail&source=g>
> 614-688-1342 (Office)mbd.osu.edu
>
>
>
> *From: *Nhcoll-l <nhcoll-l-bounces at mailman.yale.edu> on behalf of Angela
> Hornsby <horns076 at umn.edu>
> *Date: *Thursday, January 23, 2025 at 3:44 PM
> *To: *Dirk Neumann <d.neumann at leibniz-lib.de>
> *Cc: *nhcoll-l at mailman.yale.edu <nhcoll-l at mailman.yale.edu>
> *Subject: *Re: [Nhcoll-l] [EXTERN] Re: LED lights in collections
>
> Thanks for the input and resources, everyone. This is really helpful,
> especially the CCI bulletin which I had not run across yet! Angela --
> Angela Hornsby, Ph. D. (she) Zoological Collections Manager (MMNH / JFBM)
> Bell Museum University of Minnesota
>
> Thanks for the input and resources, everyone.  This is really helpful,
> especially the CCI bulletin which I had not run across yet!
>
>
>
> Angela
>
>
>
> --
>
> Angela Hornsby, Ph.D. (she)
>
> Zoological Collections Manager (MMNH / JFBM)
>
> Bell Museum
>
> University of Minnesota
>
> https://www.bellmuseum.umn.edu/zoological-collections/
> <https://urldefense.com/v3/__https:/www.bellmuseum.umn.edu/zoological-collections/__;!!KGKeukY!ztpZgmv9y3v5wk9H77YsW9QuWVS0KqD3h4ENFEVkSnnPAhUhF9t6tB44ov33jvEcCfTyMwBUxk94EDQTNQ$>
>
>
>
>
>
>
>
> On Thu, Jan 23, 2025 at 2:31 PM Dirk Neumann <d.neumann at leibniz-lib.de>
> wrote:
>
> .. depending on the quality of the LED bulbs, they can be a great
> opportunity to significantly reduce UV-emissions and UV-induced damage,
> e.g. compared to old neon lights. But not all are.
>
>
>
> Also, retrofitting old neon light sockets with modern LED bulbs however
> may create problems and should be considered with great care, because old
> and especially historic ballast units may fail and even start burning.
>
>
>
> This is also mentioned in the CCI Technical Bulleting Dee just shared
> (thanks for sharing!)
>
>
>
> All the best
>
> Dirk
>
>
>
>
>
>
>
>
>
> Am 23.01.2025 um 19:38 schrieb Callomon,Paul:
>
> Changing to LEDs makes sense in many ways. They consume a fraction of the
> energy used by incandescent or even fluorescent bulbs, and do not get
> anywhere near as hot. Both factors reduce stress on older light fixtures
> and thus the danger of sparking. They do not have ballasts, unlike
> fluorescents, and are a straight swap-out.
>
>
>
> The only possible issue is that their color temperature tends to be higher
> than that of incandescents. Some LED bulbs can be configured to “cool” or
> “warm” modes with a switch, but most are set at the factory. Cool LEDs can
> change the visual perception of colors in exhibits and shared spaces,
> though that can also be good – many dioramas and specimen displays look
> better with higher color temperature lighting, and up to now that has often
> been achieved with halogen bulbs that get very hot indeed and eat a lot of
> power.
>
>
>
> One caveat is that the optimistic durability figures many makers give –
> “lasts seven years!” are just that, optimistic. These bulbs are almost all
> made in China and to keep the price down, the QC is not all it might be.
> I’ve had them fail or start flickering (which can’t be fixed) in less than
> a year in some cases.
>
>
>
>
>
> *Paul Callomon*
> *Collection Manager, Malacology and General Invertebrates*
> ------------------------------
>
> *Academy of Natural Sciences of Drexel University, Philadelphia*
> *callomon at ansp.org <callomon at ansp.org> Tel 215-405-5096 - Fax 215-299-1170*
>
>
>
>
>
> *From:* Nhcoll-l <nhcoll-l-bounces at mailman.yale.edu>
> <nhcoll-l-bounces at mailman.yale.edu> *On Behalf Of *Angela Hornsby
> *Sent:* Thursday, January 23, 2025 1:29 PM
> *To:* nhcoll-l at mailman.yale.edu
> *Subject:* [Nhcoll-l] LED lights in collections
>
>
>
> *External.*
>
> Hi everyone,
>
>
>
> Our campus facilities management would like to change all of our general
> lighting in non-public collections spaces (dry and wet) to LEDs.  I haven't
> found any sources suggesting major negatives (e.g.,
> https://www.nps.gov/museum/publications/mhi/chap4.pdf
> <https://urldefense.com/v3/__https:/www.nps.gov/museum/publications/mhi/chap4.pdf__;!!KGKeukY!ztpZgmv9y3v5wk9H77YsW9QuWVS0KqD3h4ENFEVkSnnPAhUhF9t6tB44ov33jvEcCfTyMwBUxk-bpUVs0Q$>
> ).
>
>
>
> Does anyone have experience with the change to LEDs, particularly any
> unanticipated effects?
>
>
>
> Thanks,
>
>
>
> Angela
>
>
>
> --
>
> Angela Hornsby, Ph.D. (she)
>
> Zoological Collections Manager (MMNH / JFBM)
>
> Bell Museum
>
> University of Minnesota
>
> https://www.bellmuseum.umn.edu/zoological-collections/
> <https://urldefense.com/v3/__https:/www.bellmuseum.umn.edu/zoological-collections/__;!!KGKeukY!ztpZgmv9y3v5wk9H77YsW9QuWVS0KqD3h4ENFEVkSnnPAhUhF9t6tB44ov33jvEcCfTyMwBUxk94EDQTNQ$>
>
>
>
>
>
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>
> _______________________________________________
>
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> --
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> ******
>
>
>
> *Dirk Neumann*
>
> Collection Manager, Hamburg
>
>
>
> Postal address:
>
> *Museum of Nature Hamburg*
> Leibniz Institute for the Analysis
>
> of Biodiversity Change
>
> Dirk Neumann
>
> Martin-Luther-King-Platz 3
> <https://www.google.com/maps/search/Martin-Luther-King-Platz+3+%0D%0A+20146+Hamburg?entry=gmail&source=g>
>
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>
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>
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>
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>
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>
> --
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> Postanschrift: Adenauerallee 127, 53113 Bonn, Germany
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> society. See http://www.spnhc.org for membership information.
> Advertising on NH-COLL-L is inappropriate.
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>
> --
>
> ******
>
>
>
> *Dirk Neumann*
>
> Collection Manager, Hamburg
>
>
>
> Postal address:
>
> *Museum of Nature Hamburg*
> Leibniz Institute for the Analysis
>
> of Biodiversity Change
>
> Dirk Neumann
>
> Martin-Luther-King-Platz 3
>
> 20146 Hamburg
> +49 40 238 317 – 628
>
> *d.neumann at leibniz-lib.de <d.neumann at leibniz-lib.de>*
>
> www.leibniz-lib.de
>
>
>
> --
> Stiftung Leibniz-Institut zur Analyse des Biodiversitätswandels
> Postanschrift: Adenauerallee 127, 53113 Bonn, Germany
>
> Stiftung des öffentlichen Rechts;
> Generaldirektion: Prof. Dr. Bernhard Misof (Generaldirektor), Adrian
> Grüter (Kaufm. Geschäftsführer)
> Sitz der Stiftung: Adenauerallee 160 in Bonn
> Vorsitzender des Stiftungsrates: Dr. Michael Wappelhorst
>
>
> --
> Stiftung Leibniz-Institut zur Analyse des Biodiversitätswandels
> Postanschrift: Adenauerallee 127, 53113 Bonn, Germany
>
> Stiftung des öffentlichen Rechts;
> Generaldirektion: Prof. Dr. Bernhard Misof (Generaldirektor), Adrian
> Grüter (Kaufm. Geschäftsführer)
> Sitz der Stiftung: Adenauerallee 160 in Bonn
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