The Migro LED company provide the most excellent lights, I have used them for 18 months, nothing beats them for low heat and efficiency, I get rock hard buds and perfect green leaves every grow.
my soil is homemade, a blend of Irish peat moss and worm compost with blood, fish and bone meal, dried seaweed, chicken manure and epsom salt. Perlite is less than 5%
The week of plain water last week had no real impact, they are still very dark green, I like to lose a bit of nitrogen in flower, I may use half a dose of bio grow next feed.