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Sprout & Spectrum

PPFD Targets by Plant Type

The published bands, what sits in each, and the daily light integral each implies at realistic photoperiods.

By Scooter M. — An enthusiast who's genuinely into this. I read the manuals, compile the published specs, and do the math. No lab coat.

Published · How we pick

Bright green leaves lit strongly from above

Photographs on this site are licensed stock and are illustrative of the fixture type. We do not own the units we write about.

How this page is funded: the buy links here are Amazon Associates links, and we earn a commission on qualifying purchases at no extra cost to you. We have not been paid to feature anything on this page, we accept no free product, and commission plays no part in the ranking. Full disclosure.

We have not tested these units. Everything below comes from the manufacturer’s own published specifications, or from arithmetic we have shown our working for. Where a figure is not published, we say so instead of estimating one. Read the method.

Quick picks

Efficacy is photons out per joule in. Where a manufacturer publishes it we quote theirs; where they publish photon output and wattage but not efficacy, we divide and label it as ours; where they publish neither, the cell says so rather than guessing. Tap a row for the full write-up.

#ProductBest forEfficacyPrice
1
A gooseneck clip-on grow light clamped to a shelf beside a small houseplant
GooingTop Clip Grow Light
The cheapest way to put real light on one plant on one desk, and honest about being exactly that — a 10 W clip lamp with a repeating timer.
Low-band plantsNot published
2
A square white LED grow panel hanging above leafy seedlings indoors
Spider Farmer SF1000
Publishes PPF to two decimal places and an efficacy figure that actually divides out of it. That internal consistency is rarer in this category than it should be.
Medium-band shelves2.5 umol/J
3
A flat white-light LED grow panel suspended above a tray of young plants on a wire rack
Mars Hydro TS 1000
The most photons of anything on this list, and one of only three fixtures here that publishes both PPF and efficacy so the claim can be checked against itself.
High-band greens2.3 umol/J

The reasoning

This is a reference page. The bands come from University of Minnesota Extension’s guidance on lighting for indoor plants; the DLI conversions are ours, computed with the standard formula and shown below so you can check them.

The published bands

The three published light-level bands, in µmol/m²/s
50 – 450

Low is 50–150, medium is 150–250, high is 250–450, per University of Minnesota Extension. Nearly every indoor plant a home grower keeps sits somewhere in that span.

What each band implies as a daily total

PPFD is a rate. What a plant actually accumulates depends on how long the light is on, so the same fixture serves a very different plant at 12 hours than at 16.

DLI (mol/m²/day) = PPFD × hours × 3600 ÷ 1,000,000
Daily light integral produced by each band at three photoperiods. Computed by us from the formula above.
PPFD (µmol/m²/s)12 h14 h16 h
502.2 mol2.5 mol2.9 mol
1004.3 mol5.0 mol5.8 mol
1506.5 mol7.6 mol8.6 mol
2008.6 mol10.1 mol11.5 mol
25010.8 mol12.6 mol14.4 mol
30013.0 mol15.1 mol17.3 mol
40017.3 mol20.2 mol23.0 mol

Reading that against the seedling target of about 12 mol/m²/day published by University of New Hampshire Extension: you need roughly 250 µmol/m²/s at 14 hours, or about 200 at 16. Both are ordinary numbers for a modest fixture over a modest area.

Common indoor plants, mapped to the bands

These placements follow the extension guidance on light requirements for indoor plants. Where a plant is genuinely contested we say so rather than picking a side.

Where common indoor plants sit, and what that means in practice
PlantBandTarget PPFDNotes
Pothos, snake plant, ZZLow50–150These tolerate low light rather than preferring it; they grow noticeably faster nearer the top of the band
Ferns, calathea, peace lilyLow50–150Bright indirect in practice; direct high-intensity light scorches them
Monstera, philodendron, rubber plantLow to medium100–200Bigger leaves and shorter internodes toward the top of the range
Seedlings and transplantsMedium to high200–300The 12 mol/m²/day target; the range where stretching stops
Basil, mint, leafy herbsHigh250–400Herbs get leggy and flavorless below this; the most under-lit plant in most homes
Lettuce, salad greens, microgreensHigh250–400Fast growth is the point; below the band they bolt or stall
Succulents and cactiHigh300–450The etiolation you see on windowsill succulents is a light deficit, not a watering problem
Fruiting crops indoorsAbove the published bands450+Genuinely demanding; a home fixture over a small area is the only realistic approach

How to use this table honestly

Two warnings. First, these are bands rather than setpoints: a pothos at 160 µmol/m²/s is not in distress, it is simply growing faster than one at 60. Second, plants adapt to what they have had. Moving a plant that has spent two years in a dark corner directly to 400 µmol/m²/s will bleach the leaves it grew for low light. Step it up over two or three weeks.

Turning a target into a fixture, in one line

You want 300 µmol/m²/s over a 2 × 2 ft area of herbs.

Area = 4 sq ft = 0.372 m².

Required PPF = 300 × 0.372 ÷ 0.8 = 140 µmol/s.

The SF1000’s published 249.21 µmol/s covers that with substantial margin — meaning you could dim it, raise it, or cover a larger area.

Do the same for your own numbers in the coverage calculator, or read the sizing logic in full in what size grow light do I need.

Every pick in full

A gooseneck clip-on grow light clamped to a shelf beside a small houseplant
01

GooingTop Clip Grow Light

Clip light

Low-band plants

The cheapest way to put real light on one plant on one desk, and honest about being exactly that — a 10 W clip lamp with a repeating timer.

What GooingTop publishes

Power draw
About 10 W (source)
Spectrum
6000 K, 74 white plus 10 red LEDs, CRI 95 (source)
Dimming
Five brightness levels; repeating 4 / 8 / 12 hour timer (source)

What GooingTop does not publish

  • PPF in umol/s
  • PPFD at any distance
  • Photon efficacy in umol/J
  • The manufacturer publishes no spec sheet at all; the figures above come from the retail listing

Who should skip it

Skip it if the plant is more than about a foot across, or if you want any number at all before you buy — nobody publishes photon data for this fixture.

A square white LED grow panel hanging above leafy seedlings indoors
02

Spider Farmer SF1000

LED panel

Medium-band shelves

Publishes PPF to two decimal places and an efficacy figure that actually divides out of it. That internal consistency is rarer in this category than it should be.

What Spider Farmer publishes

Power draw
100 W +/-5% at 100-277 V AC (source)
PPF (photon output)
249.21 umol/s (source)
Efficacy
2.5 umol/J (source)
Stated coverage
2 x 2 ft core, 3 x 3 ft maximum (source)
Spectrum
650-665 nm, 730-740 nm, 2800-3000 K, 4800-5000 K (source)
Diodes
Bridgelux (source)
Dimming
Yes, dimming knob (source)
Dimensions
32.5 x 29.0 x 5.9 cm (source)
Rated life
55,000 hours (source)

Our arithmetic

  • Does the published efficacy check out against the published PPF?: Yes — 2.49 umol/J computed against 2.5 umol/J published
    249.21 umol/s / 100 W = 2.4921 umol/J. The published 2.5 umol/J is that number rounded. Not every brand's two figures agree like this, which is exactly why we divide them.
  • Average PPFD across its 2 x 2 ft core footprint: about 536 umol/m2/s
    2 ft x 2 ft = 4 sq ft = 0.372 m2. 249.21 / 0.372 = 670 umol/m2/s at perfect uniformity; at a 0.8 uniformity factor, about 536 umol/m2/s.

Who should skip it

Skip it if raw output is what you are buying — the TS 1000 delivers 38% more photons per second, at the cost of 50 W more draw.

A flat white-light LED grow panel suspended above a tray of young plants on a wire rack
03

Mars Hydro TS 1000

LED panel

High-band greens

The most photons of anything on this list, and one of only three fixtures here that publishes both PPF and efficacy so the claim can be checked against itself.

What Mars Hydro publishes

Power draw
150 W +/-5% at 100-277 V AC (source)
PPF (photon output)
343 umol/s (source)
Efficacy
2.3 umol/J (source)
Stated coverage
2.5 x 2.5 ft vegetative, 2.3 x 2.3 ft flowering (source)
Spectrum
660-665 nm, 730-740 nm, 3000 K, 5000 K (source)
Diodes
Bridgelux (source)
Dimming
Yes, 0-100% dimmer knob (source)
Dimensions
406 x 326 x 50 mm (source)

Our arithmetic

  • Average PPFD across its stated 2.5 x 2.5 ft vegetative footprint: about 470 umol/m2/s
    2.5 ft x 2.5 ft = 6.25 sq ft = 0.581 m2. 343 umol/s divided by 0.581 m2 = 590 umol/m2/s at perfect uniformity; applying a 0.8 uniformity factor gives about 472 umol/m2/s average.
  • Electricity used at 14 hours a day for 30 days: 63.0 kWh a month
    150 W x 14 h x 30 d / 1000 = 63.0 kWh.

Who should skip it

Skip it if you are lighting a bookshelf. 343 umol/s concentrated into a 2.5 ft square is far more light than a monstera wants, and you pay 150 W to deliver it.

Questions people actually ask

+How much PPFD do houseplants need?
Most foliage houseplants sit in the low band of 50 to 150 µmol/m²/s, per University of Minnesota Extension. Herbs, greens and succulents want the high band of 250 to 450. The difference between the two ends is roughly a factor of six, which is why one fixture recommendation cannot cover both.
+What DLI do seedlings need?
About 12 moles per square meter per day, per University of New Hampshire Extension. At 14 hours that works out to roughly 250 µmol/m²/s, and at 16 hours to about 200.
+Can a plant get too much light?
Yes. Past its saturation point extra photons do nothing useful, and well past it you get photobleaching — whitened tissue that does not recover. Plants also acclimate, so a sudden large increase is harder on them than the same level reached gradually.
+Why do different sources give different PPFD numbers for the same plant?
Because they are answering different questions: minimum to survive, level for healthy growth, and level for maximum growth rate are three different numbers. We use extension bands and label which is which rather than quoting a single figure as though it were definitive.

Sources

Read next

Where this sits

This page belongs to Coverage and Sizing Math. Every figure on it is either quoted from a named published source or derived in view — the full method is on our methodology page, and how the site is funded is on the affiliate disclosure.