Rauber's simple 18/6 method boasts better growth per watt.

This method uses two timers..One for the blue (445nm and lower) and one for the red (660nm). Very simple IMO.

The blue timer stays on the whole 18 hours. The red timer cycles on and off every half hour.So you have red/blue then just blue then red/blue and so on. Also you start the red 660nm timer 15 mins after your blue timer starts.That schedule makes it so the red spectrum goes off 15 min before the 18 hours of blue goes off. This gives your plants 15 mins of blue 445nm and lower spectrum just before they go to bed . No 730nm spectrum is used in this veg method so no stretch is involved..

Now.... knowing that blue LED's (445nm and lower) creates a very compact plant structure and 660 doesn't cause stretch.. What you end up with is a very strong structured plant with excellent growth..

Sal will answer and make my post seem elementary...LOL:thumbsup: