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Sky Conditions 14 June to 20 July 2000

London weather conditions have not been good for testing the blinds under all conditions as can be seen from the graph above.

Diffuse Sky Conditions (No shading system)
Defuse sky conditions Globel/Difuse

There is a strong correlation between the internal and external light readings giving a straight line response (y=0.035x) under diffuse sky conditions. This means that for overcast conditions, our testcell behaves like a near perfect integrating sphere.

Sunny Sky Conditions (No shading or glazing)
Difuse sky conditions Global/Difuse

Under clear sky it can be seen that there is a fall in the light level entering the testcell. In this case it is most likely to be a function of the reveals or the geometry of the cell. The two peaks in the image on the right-hand side are due to misalignments of the shading ring and a possible reflection. Mirrors were added to the revelals to remove their affect.

Mixed Sky Conditions (No shading system part specular reveals)
Mostly Diffuse Sky Conditions (Vertical blinding system)
Mostly Sunny Sky Conditions (Vertical blinding system)
Mostly Diffuse Sky Conditions (Awning blinding system)

Ground refectance

Mostly Sunny Sky Conditions (Awning blinding system)
Mixed Sky Conditions (Louver blinding system)
Mostly Sunny Sky Conditions (Louver blinding system)