Measurement procedures

Standards such as ASTM903, NFRC 300, ISO9050, and CEN 410 include information about how to measure spectral data and they are useful for specular glazings, but not so much for light-scattering products.

Data for the CGDB is measured and provided based on the product type.

In the files section of this page (see below) you can download detailed documents showing how to measure a specific product.

Opaque diffuse Venetian blind slats

With version 6 of WINDOW it was possible to include a layer of Venetian blind slats based on the reflectance of the slat. However, the radiosity model used does not work for specular or transparent slats. The document describes limits for how to determine opaqueness and sufficient diffuseness of the sample.

Jacob Jonsson,
Apr 29, 2014, 3:09 PM