Seed starting under lights
How Many Hours a Day Should Grow Lights Be On for Seedlings?
12–16 hours for most crops, 11 for lettuce, and why fewer hours doesn't mean fewer lights.
How Far Should Grow Lights Be From Seedlings?
2–4 in for bars, much higher for panels, and why panels rarely suit stacked shelves.
How Many Grow Lights Do I Need per Seed Tray?
The six-step math from light target to bar count, with a table from 1 to 12 trays.
How Much Light Do Seedlings Need? DLI Explained Simply
What DLI means, the 0.0036 conversion, and how hours and brightness trade off.
Do I Need a Heat Mat for Seed Starting?
Germination soil temperatures by crop, thermostat rules, and what mats cost to run.
How Much Does It Cost to Run Grow Lights for Seed Starting?
Watts × hours × price, worked for four trays, with tables by electricity price and tray count.
Drip irrigation guides are coming. Until then, the Drip Irrigation Planner shows its formulas and sources on the page.