Just an FYI - I recently discovered the works of Dr. Bruce Bugbee, professor at Utah State University. His college department has a grant from NASA for growing plants dating back decades but more recently started posting more data on cannabis growing. If you're science and data driven, I would highly recommend watching some of his videos. While a good portion is related to general cannabis growing...he drops knowledge bombs every now and again. His work on far red lighting was eye opening to me.... listed below are my favorites in order. Enjoy!.. or not!
Compulsory for growers above their 2nd or 3rd grow get in fast before YT screws with his 'druggie' content