Our premium solution for residential double glazing provides an invisible clear coating that keeps heat where it should be - inside your home. This provides year-round comfort and ensures that you and your family are always warm throughout New Zealand's changeable climate. 

LightBridge™ is capable of keeping your space naturally lit without increasing your energy consumption or power bills. 
ThermoTech 1 Relax In Year Round Comfort Energy

A lighter, brighter solution

Whether it's a home or a hostel, LightBridge™ provides superior thermal insulation without sacrificing on natural light – keeping your space a comfortable temperature.

ThermoTech 2 Energy Efficiency

Energy Efficiency

When paired correctly within a double-glazed unit, LightBridge™ products decrease heat transfer between inside and out, so you don’t have to rely so much on heating and cooling systems.



Lots of different make ups are available for additional privacy, security, noise and other benefits – making LightBridge™ suitable for almost anything you can dream of.

Diagram Igu

Double Glazed Unit

LightBridge™ is always contained within an insulating glass units to protect the near-invisible Low E coating. It can also be paired with a wide range of glass options. 

Diagram E-coating

Low E Coating

With less tint than other Low E glass, it is among the clearest in New  Zealand  with 81% light transmission providing greater natural light and clarity. 

Diagram Local

Locally Processed

All LightBridge™ double glazed units are locally processed and assembled, offering greater opportunity for tailored design and solutions.

Technical Specifications

  • Residential windows and doors
  • Multi-storey apartments
  • Commercial windows and doors
  • Minimum Size: 390mm x 190mm
  • Maximum Size: 4900mm x 2600mm*

*subject to glass type and material thickness

There are two spacer options within the LightBridge™ range.

Metal Spacer

Two pieces of glass are separated by a metal spacer and sealed to provide a hermetically sealed air gap. It has a primary water vapour proof seal and the secondary seal is supplied standard as polysulphide. Structural silicone secondary seal is an option upon request. The airspace is provided with a desiccant to prevent condensation forming within the unit.

Thermal Spacer

A thermal spacer provides low thermal conductivity. This means heat inside will take longer to transfer outside. By reducing the heat transfer at the edge of the glass a thermal spacer minimises the risk of condensation on the interior glass surface, and improves thermal comfort for all building occupants.  

Glazing compounds, sealants and gaskets need to be approved by Viridian for suitability.

Frame design - the Viridian Warranty relies on frame design in accordance with AS/NZS4666. Do not expose edges to standing water and moisture as this can result in seal failure. The frames must incorporate impervious weather seals or a self draining system.

Wind load and safety determine the type and thickness of glass required - refer Australian Standard AS1288 or New Zealand Standard NZS4223.

Installation must be in accordance with AS/NZS4666. Please refer to the technical glazing specification on the website for further installation instructions.

Visual characteristics and manufacturing tolerances - LightBridge™ is manufactured to AS/NZS4666. Also refer to the Viridian website for specification and installation information, including distortion and reflection from changes in exterior and interior pressure and temperature.

U Value* Shading Coefficient Daylight Transmission
6mm Clear / 14 / 6mm Clear
2.6 0.81 78%
6mm Clear / 14 / 6mm LightBridge 1.2 0.66 79%
6.5mm Clear VLam Silence Laminate/ 14 / 6mm Lightbridge 1.2 0.66 79%
LightBridge™ (4mm Clear/ 16mm Spacer / 4mm LightBridge™)
1.1 0.69 81%
 6mm Grey / 14 / 6mm LightBridge 1.2 0.39 37%
 6mm Clear / 14 /6mm Lightbridge (Coating on Surface 3) 1.2 0.68 81%

Where double glazing units have been used, LightBridge™ Low-E coatings are on surface 3 and 5. Centre-of-glass U-Values were calculated by Calumen II software based on EN673 conditions. SC, VLT and Tdw-ISO values were calculated by Window 7 software based on NRFC 100-2010 conditions.
*Argon gas used in U value calculation