Holographic photovoltaic (PV) module manufacturer Prism Solar Technologies Inc. of Highland, N.Y., and PPG Industries of Pittsburgh, a global paint, coatings and optical products supplier, have partnered on a project to test the performance of various types of glass in both standard and holographic PV modules at incident and direct angles. The tests will compare PPG’s Solarphire antireflection high-transmissive glass with patterned glass to determine the increase in energy yield.