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Natural light problem of museum

Author:Bill Wu    Issuing time:2015-09-02

         Natural light is a very high-quality and efficient light source, with respect to artificial light, it can bring a more comfortable visual and psychological feeling, but for the lighting design for the museum it is a very sensitive topic, because its introduction has a very obvious disadvantages, such as its illumination may vary over time and seasons, with a strong permanent UV that not conducive to the permanent exhibits protection。 


Authenticity and artistic needs natural light to represent

         The main problem of Museum lighting design is: Protect the exhibits form radiation damage as little and show its authenticity and artistic during the show。


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Fig1:Monet masterpiece "Water Lilies" donut hall in paris Musee de l'Orangerie

        There is no lamps in the hall, the light used is irradiate from the top of building and then been optical design, the aim is to let the audience experience waxes and wanes when appreciate Monet painting



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Fig2:The exhibition hall of Louvre museum that entirely use natural light 


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Fig3:Juanqin vegetarian of Forbidden City


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Fig4:Natural light museum lounge 


Why Museums rarely use natural light for illumination?


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    Fig5:Natural light Illumination


         Firstly, radiation components of natural light is complex.

         Secondly, illuminance of natural light fluctuations too lmuch, it can reach 100,000lux on the noon,, while on the evening or on cloudy days, may be as low as tens of Lux。

      Thus, if the museum want to take advantage of natural light, it must increase the number of configuration,like illuminance reducing device……


Precautions of natural light applied in museum

         Display area are relics exhibition area, which have high requirements of light. If you want to take advantage of natural light, you must handle the following questions:

         1 Changes of illuminance

Table:Illumination table

Sunrise and Sunsets

1850

Half an hour before Sunrise and Sunsets

2350

9:00 to 15:00 later 

5000-4800

Average Illuminance

 5500

The direct light at summer noon

5800

The direct light at autumn noon

6000-6500

  Cloudy day sky light

6400-7000

Soupy weather sky light

7500-8500

Thin cloud sky light

13000

       

         2 Components of natural light

         3 Integration of color temperature

         4 Glare control


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Fig6:The British Museum 


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Fig7:Suzhou Museum


          After the previous analysis, we can find out what kind of light museum need:

          Illumination and people comfortable light

          Soft and clean light

          Vivid and pure light


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