[NHCOLL-L:3416] RE: light levels for mineral specimens

[Kris]

Cherry

 

We have recorded radiant light readings with HOBO dataloggers on fossil
material for the past three years. These fossils are in situ enclosed in a
building and exposed to light via windows above the bonebed.  About 18
months ago we initiated a study on radiant light and the impact on specimens
as readings were above considered acceptable standards.  We noticed fading,
darkening, yellowing, and embrittlement, all signs of damage by radiant
light.  CCI, SPNHC, and NPS are the sources for recommended standards on
radiant light.  Readings should not exceed 200 lux or 20 lumen for organic
materials and 300 lux or 30 lumen for materials that are not light
sensitive.

 

Hope this helps.

 

Cheers

 

Kris

 

 

From: owner-nhcoll-l at lists.yale.edu [mailto:owner-nhcoll-l at lists.yale.edu]
On Behalf Of Cherry Johnson
Sent: Thursday, April 26, 2007 10:09 AM
To: NHCOLL-L at lists.yale.edu
Subject: [NHCOLL-L:3415] light levels for mineral specimens

 

Hi All,

Could anyone advise as to preferred light levels for exhibiting minerals.  

Obviously, there are some that can be really damaged by light and some not
so much.  Any input would be helpful.

Thanks,

Cherry

 

 

 

Cherry Johnson

Collections Manager

Weinman Mineral Museum

PO Box 3663

Cartersville, GA  30120

770-386-0576 x 405

770-386-0600 fax

 

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