oh GEESH that chart just made me O_o
i don't think glosso needs 100+ PAR lighting...
i've got mine vertical, 23W, roughly 8-9 inches from the substrate.
guess ill be bringing it back down to 13W..
You can use this as a reference. The water line is 7.3 inches. So the first example is 18.3 inches from the substrate, Second example is 13.3 inches from substrate and the last (kinda like yours) is 10.3 inches from substrate. All using 23W bulbs.