My tapwater is 300ppm, a tblsp of epson bring 5g bucket to 400, 2 tbsp epsom brings to 500, 400 ppms veg then nute to 700ppm or 800ppm for veg 2 tbsp epsom for flower 1000 to 1200ppm for flower, might push it if big. My light rated 1550 nm per second per meter squared about 1200 useable nms per sec per m2. L try to match nutes ppms to nms. 660w light 41 watts per sq ft. I give 1 ft for flower 2ft plus for veg, no dimmer so veg 16x8 as too much light for them, once at 12hr all is good. Look up DLI for veg 20 is good flower 35 and up. Think light might be too much for them.