Product/Highest performance:
Visible light transmission |
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LiteZone® achieves high R-values with good visible light transmission.
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To achieve very high window R-values a glass unit will necessarily have a lower visible light transmission (VLT). Because the human eye will adjust to the amount of available light, most people will not notice a reduction in VLT until it falls below about 30%. Many LiteZone® product offerings have good to excellent VLT. The adjacent chart shows the VLT for varying R-values of selected LiteZone™ windows. The chart shows LiteZone® and R11.9 windows have VLT of 47% and 43% respectively. This is the range that some triple pane R6.5 windows achieve, depending on the low-e coats used (assuming glass without tints). Many commercial buildings have VLT below 30%. For example buildings using grey tinted glass have a VLT around 25%. The adjacent photo shows a curtain wall panel being installed. The left side is open and therefore has 100% VLT which can be compared to the tinted glass on the right side with 24% VLT. |
100% VLT vs 24% VLT
Click on photo to see larger image.
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