PPFD Chart for Indoor Crops: Light Targets for Seedlings, Greens, Herbs and Tomatoes
A research-based PPFD chart for seedlings, microgreens, lettuce, basil and tomatoes, with the DLI formula, a conversion table and a step-by-step way to hit each target.
How Many Hours of Light Do Seedlings Need? (14–16 Is the Sweet Spot)
Seedlings need 14–16 hours of light and a dark night. Here is how light intensity changes the hours, with crop targets and a timer schedule.
How Far Should Grow Lights Be From Seedlings? Grow Light Distance by Light Type
Fluorescent tubes 2–4 inches, LEDs higher: extension-backed grow light distance for seedlings, the PPFD behind it, and how to adjust the height.
