I just wanted to let everyone know that I just finished a book by Linda-Chalker-Scott called "The Informed Gardener " and in her book she says that there have been many scientific studys on the causes of leaf spot and not a single one shows the cause of which is from watering your plants with the lights on. I know alot of people think that if you water during lights on , that the water will bead up on the leaves and act as little magnifying glasses, therefore causing brown spots. This is misinformation that I thought you all might like to know. So dont be afraid of water during lights on.
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ok but there is a lot of info missing..like is it talking for outdoors ? indoors ? what kind of climate ? where i live, today its 41C outside i would be crazy to spray them when the sun is up . if you already give (maybe from mistake) higher par on the canopy? and many more. my experience and what i have seen says otherwise . would be very interesting to have some links on the papers. so many questions lol