The CGDB is a new optical properties database for optically scattering (complex) systems, such as shading devices and materials (e.g., venetian blinds, roller shades, drapes, cellular shades, shade fabrics, etc.), light redirecting materials (e.g., prismatic films, etc.) and scattering glazing (e.g., diffuse glass, glazing frits, decorative glass, etc.). This database is similar in nature to its more well-known counterpart for specular glazing, the IGDB.
You can download the CGDB here.
Currently there is no approved procedure to measure large number of different shading materials and and/or devices. These procedure and measuring criteria are currently being developed at LBNL and will be published for most products before the end of 2014. After the publication of measurement procedure, an inter-laboratory comparison (ILC) will be conducted when there are at least two commercial laboratories that will participate in the ILC. The ILC is expected to be completed, and a full report published, within a year of its commencement. Upon completion of a successful ILC, with at least 1 commercial laboratory showing competence, commercial measurement of scattering systems will be approved.
If you would like to learn about measurements of scattering materials and devices, please visit our Measurement Procedures page for more information.
In the mean time, all measurements for CGDB will be done by LBNL. If you have a product that you would like to be measured and/or included in the CGDB, please contact us via email at CGDB@lbl.gov.