Looking good to me @SkleavitLaFlare The tip burn shows that you pushed hard with the ferts but as long as you continue to use only plain water for the remainder of the grow and allow a decent amount of run off with each watering you'll be aok!
What set up are you using to grow those girls, the flowers are looking nice, how's the smell?
Sounds like a great setup for personal! The 1000w light could be anywhere from 200 to 500 actual watts at the plug but still perfect for several ounces of quality medicine
Organic ferts are the cheapest and arguably best option maybe consider it when your GHs runs out