Energy Efficient Glass Range available in 3 variants:

Lite 1

This cost effect NRG efficient clear product will allow lots of natural light into your building.

With its Low E surface coating it will increase thermal insulation and is recommended for areas where moderate solar heat and light management are required.

It is available in monolithic, toughened or laminated options.

Intermediate 1

This NRG efficient product is recommended where a higher Solar Control is required than NRG Lite.

It has both solar and Low E coatings which will eliminate 45% of solar heat whilst still allowing for 60% visible light depending on the tint which is chosen.

Available in various tinted laminated options.

Optimum 1

This NRG efficient product has the highest solar control of the range whilst still providing medium visible light transmittance

The solar and Low E coatings assist with reducing the long term energy cost of your building.

Available in various tinted laminated options.

Performance Specifications

NRG Lite 1 - performance data based on 6.38mm Clear Low E
NRG Intermediate 1- performance data based on Neutral 60 Low E
NRG Optimum 1 - performance data based on Neutral HL Low E



Visible Light Transmission is simply the measurable amount of solar visible light (daylight) that travels through a glazing system. A glazing system with a high VLT allows most of the daylight to pass through while a lower VLT window restricts the majority of light from entering a room.


The U-value of a window is a measurement of the rate of heat loss indicating how well your windows are keeping valuable heat in. It is expressed as Watts per square meter Kelvin W/m2 K. The lower the U-value the better the thermal performance of the glass.


The Solar Heat Gain Coefficient is the fraction of incident solar radiation admitted through a window, both directly transmitted and absorbed and subsequently released inward. SHGC is expressed as a number between 0 and 1. The lower a window's solar heat gain coefcient, the less solar heat it transmits.


The Relative Heat Gain is the amount of heat transferred through glass or a glazing system, taking into account radiative (solar) heat gain and thermal conductive heat transfer.