Comment Comment by bob1029 We can break the 5500K temperature limit with passive elements and some clever engineering.https://en.wikipedia.org/wiki/Solar-pumped_laserhttps://ieeexplore.ieee.org/document/1553831 parent bob1029 20 hours ago
https://en.wikipedia.org/wiki/Solar-pumped_laser
https://ieeexplore.ieee.org/document/1553831