Kenneth,
LEDs and LEDs are not always the same. Much criticism arose in the last
month just because some scientists did not test the newest generation of
leds. In the upcoming issue of MUSEUM AKTUELL we will publish an article
on the newest LED generation and it difference to older developments.
Best
Christian
Am 16.03.2012 18:18, schrieb Marc A Williams:
> Kenneth,
> My local NPR station did a program on advances in lighting last fall.
> One of the interviewees was a scientist at Rochester Institute of
> Technology (RIT) who was working in developing LED lighting. He said
> that since LEDs are digital devices, they can be tuned to any specific
> need - color, intensity, etc. However, he said that full
> customization to specific needs in the marketplace was still probably
> a couple of years away. So, are these MR-16 bulbs you are considering
> of the newer generation, or of the old technology? Problems that I
> have heard of are the following with LED lamps in general.
> Poor color temperature. They do not replicate the generally desirable
> museum standard of daylight.
> Even worse Color Rendering Index (CRI), or the accuracy of the color
> at a specific color temperature. 100 is perfect. If your existing
> MR-16s are Solux lamps, they will have a CRI of 98. 95 or higher is
> desirable for most museum applications. LEDs may have CRIs as low as
> 50 or so.
> Poor long-term light intensity. LEDs have been reported to drop as
> much as 50% in output at the half life of the bulb.
> Ask the bulb manufacturer for the color temperature, CRI and
> lifespan intensity data. This is all standard information in the
> lighting industry. If the specs are up to snuff, buy a few and try
> them to see if you like the result. If not, wait a couple of years
> until the newer generation is available to make the switch.
> Marc
>
> American Conservation Consortium, Ltd.
> 4 Rockville Road
> Broad Brook, CT 06016
> www.conservator.com <http://www.conservator.com>
> 860-386-6058
>
> Marc A. Williams, President
> MS in Art Conservation, Winterthur Museum Program
> Former Chief Wooden Objects Conservator, Smithsonian Institution
> Fellow, American Institute for Conservation (AIC)
>
> ----- Original Message -----
> *From:* Kenneth MacLennan <mailto:[log in to unmask]>
> *To:* [log in to unmask]
> <mailto:[log in to unmask]>
> *Sent:* Friday, March 16, 2012 12:56 PM
> *Subject:* [MUSEUM-L] Query: replacing halogen track lights with LEDs
>
> Dear fellow list members,
> We have a track lighting system that uses mostly fifty-watt MR16
> halogen lamps in canisters, and we've been looking at the
> possibility of replacing the bulbs with one of the compatible LED
> types currently on the market--some brands available for as little
> as six or seven dollars a lamp. Have any of you had experience
> with any of these LED bulbs? Good, bad, both? Thanks!
> Kenneth A MacLennan
>
> "Feelings are indispensable to man, but they become terrible the
> moment they see themselves as values, as criteria of truth, as
> justifications for behavior."
> --Milan Kundera, Jacques and His Master (1981), Introduction (tr.
> Simon Callow, 1985)
>
> ------------------------------------------------------------------------
>
> To unsubscribe from the MUSEUM-L list, click the following link:
> http://home.ease.lsoft.com/scripts/wa.exe?SUBED1=MUSEUM-L&A=1
> <http://home.ease.lsoft.com/scripts/wa.exe?SUBED1=MUSEUM-L&A=1>
>
>
> ------------------------------------------------------------------------
>
> To unsubscribe from the MUSEUM-L list, click the following link:
> http://home.ease.lsoft.com/scripts/wa.exe?SUBED1=MUSEUM-L&A=1
> <http://home.ease.lsoft.com/scripts/wa.exe?SUBED1=MUSEUM-L&A=1>
>
--
Der Verlag Dr. C. Müller-Straten ist spezialisiert auf Museums- und Restaurierungsfragen. Er gibt die leserorientierte monatliche Fachzeitschrift MUSEUM AKTUELL und Bücher (beides auch online) in Deutsch und Englisch heraus und betreibt ein grosses Internetportal für Museumsprofis und Museumsbesucher. Ansprechpartner für inhaltliche Fragen: Dr. Adelheid Straten, Dr. Christian Müller-Straten; für kaufmännische Fragen: Dr. Christian Müller-Straten.
T. +49-(0)89 839 690-43, Fax -44, [log in to unmask] http://www.museum-aktuell.de
=========================================================
Important Subscriber Information:
The Museum-L FAQ file is located at http://www.finalchapter.com/museum-l-faq/ . You may obtain detailed information about the listserv commands by sending a one line e-mail message to [log in to unmask] . The body of the message should read "help" (without the quotes).
If you decide to leave Museum-L, please send a one line e-mail message to [log in to unmask] . The body of the message should read "Signoff Museum-L" (without the quotes).
|
