What if there is no sun? 
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It works well even during overcast day, because ambient light is greater even when overcast. I've see this installed in many houses in South Africa.

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viste esto
@hernannadal ? :) -
Si! Son buenísimos. Hace rato que existen. Pero pocos arquitectos lo usan.
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a great concept.
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عسى ماتصير غاليه بس
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Awesome
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Great applications
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Way ahead.
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@AndrewKatnik could’ve used one of these in 310Thanks. Twitter will use this to make your timeline better. UndoUndo
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nice, but i think expensive. And needs certain conditions
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