Eternal Sun B.V. acquired the solar PV testing division of Spire Solar in 2016. Eternalsun Spire is a leading manufacturer of solar simulators and integrated climate chambers for measuring the performance and reliability of PV modules. Eternalsun Spire serves a global customer base of PV module manufacturers, research institutes and test laboratories.Our mission is to contribute to the development and growth of the solar industry by enabling the highest degree of measurement control and certainty by providing high-end solar testing knowledge, technology and services. Eternalsun Spire simulators have renowned capabilities regarding repeatability, reproducibility, spectrum, uniformity, and stability. Since 2002 the Spi-Sun Simulator has become the industry standard in module performance testing. It is now used by more than 30 standards testing and certification laboratories worldwide and is a staple in mass production lines around the globe.