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LiteZone Glass Inc.
  • Home
  • Overview
  • Product
    • How it works >
      • Construction
      • Scalability
      • Insulation zone >
        • Insulation zone slide show
      • Minimizes weight
      • No "kissing"
    • Highest performance >
      • Performance values
      • Testing
      • Visible light transmission
      • Complements wall R-values
    • Human comfort >
      • Comfortable spaces
      • Sound insulation
      • Blocks ultraviolet light
    • Extreme longevity >
      • Long life overview
      • Air filled
      • Pressure equalized
      • Superior film suspension
      • Superior spacer and edge seal >
        • Spacer and edge seal slide show
        • Why IGUs fail slide show
    • Reduce costs >
      • Reduce capital costs
      • Reduce energy costs
      • Lowest cost relative to performance
      • Large windows
      • Life cycle costs >
        • Video: Glass Tower Problems
  • Applications
    • Upgrade old or failed IGUs
    • Instead of triple pane
    • Renovations
    • New construction
    • Sunrooms
  • Projects
    • Replacement of failed IGUs in residence
    • Replacement of IGUs in high-rise buildings
    • Upgrade old windows
    • LiteZone® IGUs in fiberglass window frames
  • Featured Curtain Wall Project
  • "Frameless" Installations
  • Window Systems
  • Curtain Wall Systems
  • Curtain Wall Upgrades
  • Purchase
    • Direct
    • Through partners
    • Become a partner
    • Warranty
  • In the Media
  • Contact
LiteZone Glass Inc.

Product/Highest performance:

Visible light transmission

Performance Values
Testing
Complements wall R-values

​LiteZone
® achieves high R-values with good visible light transmission.


​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.
Picture
100% VLT vs 24% VLT
Click on photo to see larger image.
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