Just watched a short TV report on an experiment using approx 5 red to 1 blue LED's to grow things like tomatoes. The professor being interviewed stated the tomatoes being grow prefered a combination of red and blue LED's. Although he never meantioned the ratio of each from what I could see of them the were approx 5 reds to blue. He went on to say they are getting excellent growth rates and are very healthy. The tomatoes grown in a green house aslo get sunlight during the day with the LED's on at night with just a 2 hour rest period when they are in the dark.