Daylighting with Light Diffusion

Glare-free light filling the architectural space.

Light diffusing glazings are powerful elements for designers who wish to bring high quality natural light into interior spaces. Translucent glazings vary greatly in their ability to diffuse light, and selecting the right glazing can be critical to the success of a project. However there is no simple rating system that allows a designer to simply compare the performance of light diffusing glazings at a glance.

Vision_Skylight      Solera_Skylight

Full characterization of a translucent glazing results in a large multidimensional set of data that is too complicated for anything but an optics expert or a computer simulation program. On the other hand, simple numbers like ASTM’s ‘haze’ are not designed for this purpose and cannot differentiate between between common glazings with very different light diffusing abilities, such as Solera vs. acid etched glass.

Light Diffusing Power (LDP) is a new measurement and rating system that allows building designers to objectively compare light diffusing ability of various glazings. Below is a brief example to illustrate what it is, and a detailed explanation follows. The example below illustrates LDP and its impact on daylighting and light levels.

LDP Experiment Setup

The glazing sample is illuminated by a quartz halogen spotlight, at an incidence of 45 degrees. A light meter measures the radiant intensity leaving the aperture in the mask that covers the back of the sample. The measurement is repeated over a range of angles from -85 to +85 and the results are recorded. (Measurements at exactly 90° not physically possible)

LDP Setup Experiment

Below is a brief video demonstrating the exceptional light diffusion of Solera vs Acid Etched Glass and White Laminated Glass. These products typically can be classed as “Narrow Angle Light Diffusers” vs Solera “Wide Angle Light Diffuser”.

For a technical brief on the LDP setup and experiment contact our R&D Department.

Solera is highly configurable, and varied ranges of Visual Light Transmittance (VLT) and diffusion can be specified. Contact your local regional manager for specification support.