With a 100W LED, most home growers pull roughly 1 to 2 ounces (28–56 g) of dried flower per plant, while a well-tuned setup with strong genetics can reach 3 ounces (about 85 g). The widely quoted benchmark of 0.5–1 gram per watt puts a 100W fixture at about 1.8–3.5 ounces per plant when everything else — light distance, canopy shape, pot size, and environment — is on point. First-time growers usually land closer to half an ounce to 1 ounce per plant.
How Many Ounces Per Plant With a 100W LED?
Plan for 1–2 ounces per plant and treat 3 ounces as an excellent result. A true 100W board flowers roughly a 2x2 ft footprint, which comfortably fits one well-trained plant or two small ones. Yield tracks how much light energy the canopy actually absorbs, not the wattage printed on the box.
cannabis yield per plant outdoor
Key Features That Decide Your Yield
- Light distance: 12–18 inches during flower keeps intensity in a productive range without bleaching tops.
- Daily light integral: 30–45 mol/m²/day is the target for flowering cannabis.
- Coverage: a genuine 100W fixture flowers about 2x2 ft; stretching it over 3x3 dilutes results.
- Pot size: 3–5 gallon fabric pots give roots room to support heavier colas.
- Plant count: one trained photoperiod plant usually out-yields two untrained autos in the same space.
- Training: LST and SCROG flatten the canopy so lower buds receive real light instead of shadow.
- Genetics: compact, high-yield hybrids convert light into weight far better than stretchy sativas.
- Environment: 75–80°F, 40–50% humidity in flower, and steady airflow prevent the stress that stalls bud development.
What a 100W LED Actually Delivers
Modern 100W fixtures use efficient diodes with added 660nm red and run cool enough to hang close without a heat spike. Expect about 2x2 ft of usable flowering coverage at 12–18 inches, a real draw near 100W at the wall, and tens of thousands of hours of usable life. Pair the light with a 4-inch exhaust fan, a small oscillating fan, and a timer set to 12/12 for photoperiods. Keeping a simple journal of plant height, feed strength, and final dry weight is the fastest way to move from 1 ounce to 2–3 ounces per plant on your next run.
Optimizing Yield: Grams Per Plant in a 5-Gallon Bucket
Shipping and Returns
Eden Cannabis ships orders discreetly in plain packaging and offers in-store pickup at our licensed locations, so you can grab supplies on the way home. If anything arrives damaged or not as described, contact us and we will make it right with a replacement or refund under our posted policy. All products are lab-tested and sold only to adults of legal age.
Is a 100W LED enough for one plant?
Yes. One plant in a 2x2 ft tent under 100W can finish with a solid 1–2 ounce harvest when light distance and airflow are dialed in.
How long until harvest under 100W?
Autos typically finish 70–90 days from seed, while photoperiods need 8–10 weeks of flowering after the flip. Yield depends more on canopy health than on total days.
Can I get more than 3 ounces from 100W?
Rarely. Pushing past 3 ounces usually means adding a second fixture, upsizing the pot, or running a high-yield strain with a perfectly flat canopy.