Efficiency of fixtures using integrating sphere measurements compared with flat-plane integration.

z-Utah State University y-The flat-plane integration may have made an inadequate number of measurements to fully characterize the output of some of the lamps. The electric consumption (watts) by the fixture was nearly identical among test sites and did not likely have a significant effect of efficiency. x- Photon Output per Electrical Input (µmol per second divided by joules per second).