I love these photos! 5 consecutive days of growth on my new L2 scrubber. first photo shows screen with lights set at about 7 o'clock. Photos 2 turned up the lights halfway. Photo 3 about 3/4 turn. Photo's 4 & 5 lights on full! In just FIVE days I was able to turn the lights to max. This is my third week running the scrubber. I am running the lights 16 hours right now. I might go to 18 hours depending on my nitrate levels this weekend. I will post photos of growth after 4th week, hopefully the screen will be completely full of algae.