Risk Management > Light > Natural Daylight
Calibarted test strip for UV-degradation, south exposure, north end, second floor, Rosecliff.
Light meter, acrriage display, Breakers' Stables.
Bedroom, west elevation, second floor, Château-sur-Mer.
Blind, window, west elevation, first floor, Château-sur-Mer.
___, south elevation, first floor, Château-sur-Mer.
Light damage, west windows, second floor, The Elms.
Faded window treatment, south end, second floor, Rosecliff.
Chair near window, east elevation, apartment, third floor, The Breakers.

With the elimination of ultraviolet radiation through the windows, each house needs to consider means to reduce the intensity of the daylight. A broad array of tinted UV elimination films can reduce the level or intensity of daylight by up to 40%. The higher the reduction capacity the greater the reflective coating that is viewed from the outside of the building. As this will impact the aesthetic of the historic building exteriors, different products will need to be examined for compatibility. The use of polyester woven sunscreens (similar to sophisticated wondow screening materials) is a second option that allows the visitor to view the outside but allows daylight to be dimmed to more acceptable levels on the interior. The simplest method, the use of scrim shades, opaque curtains or the closing of shutters will also reduce the brightness and path of sunlight. These are labor intensive and dependent on the time of day. Often the responsibility to control the mechanical means of dimming or deflecting the light falls upon the caretaker. The education and involvement of the tour guides during visitation times in this task is another potential staff resource on site to control to the mitigation of this risk.
(insert photo Elms, GA, or Kingscote of daylight)

The establishment of a light monitor program is the first step to evaluating the mitigation methods to reduce the light risks. The use of the meter will guide you in monitoring the light levels to insure they mean museum standards. The levels should be documented on an data entry sheet on a consistent basis to help you gather information on variations that occur during the daily and seasonal cycles. The PSNC owns a meter to monitor the light levels. Given the multiple sites and size of the houses, data loggers which gather the information are a cost effective way to implement a light monitoring program. In addition to gathering information on the intensity of light, a program to note the seasonal paths of daylight as it falls through windows is important to gather. Understanding the seasonal arcs and the areas in rooms upon which the light falls will allow a discussion about the placement of objects or their substitution during peak periods of direct contact. With training by the preventive care conservator, caretakers and tour guides could be responsible for gathering and mapping this data.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

   © 2002-03 Philip C. Marshall and Preservation Society of Newport County