> The most efficient light emitters are ~50% and the best optical photo-voltaics are also ~40%, which would get you to an 80% loss, ignoring atmospheric losses

> The most efficient light emitters are ~50% and the best optical photo-voltaics are also ~40%, which would get you to an 80% loss, ignoring atmospheric losses. Unless you have matched emitters and PV cells? For example [1] cites 53.4% conversion efficiency for monochromatic light. (The 40% figure was presumably sunlight conversion efficiency?) [1] https://ieeexplore.ieee.org/document/4922910 https://ieeexplore.ieee.org/document/4922910