Hate to see TGSC go but their lights are still great, a little pricy which is why I gave 4 stars instead of 5, probably one of the most expensive 300W lights out there but still had great results.
Starting using Bulletproof Si in 2019, bottle lasts a long time, plants seem to love, helps with thickening up the stems and holding heavy flowers without breakage, I call it my "invisible trellis".