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Question:

Is there a dog that can stand some heat? I live in Nevada and need a watch dog.

I live in nevada and it gets hot sometimes, Is there such a breed that can tolerate heat better than others, its a dry heat

Answer:

I think there is a disconnect between a light-gathering roof and roof structure in how you define the project. Structural implies load-bearing - that part of the building system that carries the weight and provides the skeleton. I really think you mean the skin of the roof. Siemens makes a light-gathering glass - that is with a polymer coating that allows light in at a direct angle and reflects it internally at an acute angle - Akin to a very efficient Low-E glass system in the visible part of the light spectrum. That may not fit the 'low-cost' requirement. However it is highly scratch-resistant which is important for an exposed material as well as reasonably impact resistant. There are a few optical acrylics out there that have scratch-resistant coatings that are also light-conductive and come in large sheets. They have excellent impact resistance. Not cheap either. But I think it is going to come down to siting a clear roof to the south and then using tracking reflective panels to bring light inside. In that case, you would use a true Low-E glass to reduce UV and heat-gain, but bring as much natural light inside as possible. You would be using conventional materials (read: Cheaper) with a little bit of off-the-shelf technology (tracking system controls) and conventional mirrored panels, also not horribly expensive. But, as it happens, I think you may be taking an overly-conventional approach to the issue. If you were to use transparent photo-voltaic panels (linked below), you could get light and power from the sun - and with a little bit of storage using LED-lighting technology get good full-spectrum light day and night. Forget using public lighting for interior illumination - most of it is of an entirely unsuitable spectrum for that purpose. Green, blue or orange-skinned people are not attractive, and many colors are not rendered properly. Public lighting is for way-finding, not for any other purpose.
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