Standardized Instrument Package: A package of instruments obtained through a grant from NSF funds has been maintained and continuously updated as new instrumentation has become available. Of particular interest and emphasis has been the accurate measurement of radiation in the chambers, including the photosynthetic wavelengths, long wave intensity, and most recently ultraviolet wavelengths. This instrument package is maintained by one laboratory with regular auditing of the instruments and is forwarded to anyone requesting it for a 2 week period of use with payment of a fee of $300 that provides funds for instrument maintenance and purchase of new instruments that become available. Some instruments have been provided at no or reduced cost by the instrument companies. For more information visit: