Best full spectrum LED grow lights
Eight lights measured with a spectroradiometer from 380 to 780 nm. Three had no meaningful output above 700 nm despite claiming a full spectrum.
Every product here was bought at retail and tested with our own instruments. Where a product failed, that is in the review.
Grow lights, plant stands, and the spectrum question.
Eight lights measured with a spectroradiometer from 380 to 780 nm. Three had no meaningful output above 700 nm despite claiming a full spectrum.
Six stands measured for per-shelf light uniformity, height travel and wet-load stability. Two MDF shelves had swollen by week six.
PPFD measured at real working distances rather than at the manufacturer's idealised height. Three lights deliver; two overstate their specs.
Six meters checked against a quantum sensor. Where lux-to-PPFD conversion holds up, and where phone apps fail outright.
Pruning, cutting, and grafting equipment.
Twelve pruners tested for cut force and cambium damage. Six could not cut the diameter their own packaging claimed.
The debate gets settled by preference. It should be settled by what each cut does to the cambium layer.
Bud-eye direction, cane age, and the dieback that follows a stub cut. The anatomy behind the rules.
Timers, emitters, soaker hose, and getting water to the right depth.
Six kits, one full growing season, and measured flow spread at every emitter. The pressure-compensating kits won and the gap was not close.
Shrink-swell clay and differential settlement. The delivery rate that gets water into the soil, and the mistakes that make it worse.
Flow rate, zone count, and the battery-versus-solenoid question. A checklist you can take to any product page.
Nine meters calibrated against a pot drying on a scale. Probe depth mattered more than any meter's accuracy.
Eight sprinklers on a 24-can grid for distribution uniformity. Hose pressure quietly ruins most coverage claims.