They still look heathy. Your top leaves are still perky and green. It's a learning process. I over watered my plants when I first started growing. Keep a written grow journal it will help.
Get a hydrometer. It will let you know how wet the soil is until you get to know how much your plants drink. The top layer of soil could be dry but half way down it could be soaked. Over and under watering show almost the same signs. The meter will let you know what is going on. The pot size...
I had the same issue when I switched from CFL to LED. InTheValley is right about the lux.
20,000-28,000 lux for veg
40,000-50,000 for flower
Had to get my lights closer. My lux would drop off faster the further the LEDs were than my CFLs.