Grow Lights for Monstera
A monstera is a medium-light plant, not a high-light one — and the split leaves everyone wants are mostly a maturity question with a light component.
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
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.
| # | Product | Best for | Efficacy | Price |
|---|---|---|---|---|
| 1 |  SANSI 36W BR30 Grow Light Bulb The rare grow bulb that publishes both PPF and a PPFD figure with the measurement distance attached, which is the only reason it can be sized honestly. | One monstera | 1.82 umol/J (ours) | |
| 2 |  Soltech Aspect Gen 2 The only fixture here you would willingly hang in a living room, and the only one publishing PPFD at three separate distances so it can actually be placed by the numbers. | A living-room specimen | 1.39 umol/J (ours) | |
| 3 |  AC Infinity IONBOARD S22 The highest published efficacy of any fixture here at 2.7 umol/J, on Samsung LM301H diodes, with dimming in real 20% steps rather than a vague knob. | A big mature plant | 2.7 umol/J |
The reasoning
Monstera deliciosa is a medium-light plant. Iowa State University Extension’s 6-to-10 mol/m²/day band for foliage and flowering houseplants is the right target, and it is worth stating clearly because monstera advice online drifts in both directions — people either treat it as a low-light plant that will thrive in a dark corner, or throw a 150 W panel at it.
Iowa State University Extension's band for foliage and flowering houseplants. In the wild it grows as a climbing hemiepiphyte in dappled forest light, which is genuinely bright — just never direct.
What that means for a fixture
Target 8 mol/m²/day at 12 hours a day. PPFD needed = 8 × 1,000,000 ÷ (12 × 3600) = 185 µmol/m²/s.
A mature monstera has a canopy roughly 3 × 3 ft — 9 sq ft, or 0.836 m². 185 × 0.836 = 155 µmol/s landing on the leaves; at 0.8 uniformity the fixture needs to produce about 193 µmol/s.
That is beyond a single grow bulb (SANSI publishes 65.6 µmol/s) and comfortably inside a 100 W-class board (the IONBOARD S22 implies about 311 µmol/s from its published 115 W at 2.7 µmol/J).
For a smaller monstera with a canopy about 1.5 × 1.5 ft (0.209 m²), the requirement drops to 185 × 0.209 ÷ 0.8 = 48 µmol/s — well inside a single bulb. Plant size drives this far more than plant species does.
Distance and placement
University of Minnesota Extension recommends 12 to 24 inches from the light for foliage houseplants. For a monstera that generally means mounting above and slightly to one side, because the plant is wider than it is deep and the productive leaves are on the outside of the canopy.
Rotate the pot a quarter turn every couple of weeks. Monstera lean toward light noticeably, and an unrotated plant develops a flat back and a lopsided crown that is very hard to correct later.
About fenestration
The split, holed leaves are the reason most people buy the plant, and the honest answer about light’s role is more nuanced than most sources allow. Fenestration is primarily a maturity trait — juvenile monstera leaves are entire, and the plant produces fenestrated leaves as it matures and climbs. Light is a contributing factor because a plant with insufficient light stays juvenile longer and produces smaller leaves, but light is not a switch that turns fenestration on.
What genuinely helps, in rough order of effect: giving it something to climb (a moss pole or plank — monstera are climbers and mature faster with support), adequate light in the 6-to-10 band, adequate pot size, and time. Anyone promising fenestration from a light purchase alone is overselling.
Signs you have it wrong
| What you see | Likely meaning |
|---|---|
| Long bare stem between leaves, plant leaning hard | Under target. Move closer to the light or supplement. |
| New leaves smaller than old ones, no splits appearing | Under target, or the plant has nothing to climb, or both. |
| Yellowing lower leaves in winter | Often overwatering at low light rather than a light problem directly — a plant receiving less light uses less water. |
| Pale washed-out patches on leaves facing a window | Too much direct sun. Monstera want bright indirect light, not direct. |
| Steady new growth, leaves the same size or larger | About right. Leave it alone. |
For a large mature specimen, the geometry problem is covered in grow lights for large indoor plants, and the full table of targets is at PPFD targets by plant type.
Every pick in full
SANSI 36W BR30 Grow Light Bulb
Grow bulbOne monstera
The rare grow bulb that publishes both PPF and a PPFD figure with the measurement distance attached, which is the only reason it can be sized honestly.
What SANSI publishes
- Power draw
- 36 W (source)
- PPF (photon output)
- 65.6 umol/s (source)
- PPFD
- 265.58 umol/m2/s at 1 ft (source)
- Spectrum
- 4000 K, 400-780 nm, CRI close to 100 (source)
- Rated life
- 25,000 hours (source)
Our arithmetic
- Efficacy, computed from the published figures: 1.82 umol/J
65.6 umol/s / 36 W = 1.82 umol/J. That is roughly a third less efficient than the panels on this page — the price of a screw-in form factor. - Electricity used at 12 hours a day for 30 days: 12.96 kWh a month
36 W x 12 h x 30 d / 1000 = 12.96 kWh.
What SANSI does not publish
- Beam angle
- Fixture dimensions
Who should skip it
Skip it if you are lighting more than one plant. 65.6 umol/s is a small amount of light spread over a cone — it lights a single specimen, not a shelf.
Soltech Aspect Gen 2
PendantA living-room specimen
The only fixture here you would willingly hang in a living room, and the only one publishing PPFD at three separate distances so it can actually be placed by the numbers.
What Soltech publishes
- Power draw
- 36 W (source)
- PPF (photon output)
- 50 umol/s (source)
- PPFD
- about 50 umol/m2/s at 1 m, 34.9 at 4 ft, 15.5 at 6 ft (source)
- Spectrum
- 3000 K warm white, CRI 98 (source)
- Dimming
- Yes, in-line dimmer 10-100% (source)
- Dimensions
- 3.5 x 3.5 x 6.2 inches (source)
- Rated life
- 50,000 hours (source)
Our arithmetic
- Efficacy, computed from the published figures: 1.39 umol/J
50 umol/s / 36 W = 1.39 umol/J. Roughly half the efficacy of a 2.7 umol/J board — the design premium is paid twice, once at purchase and again every month on the meter.
Who should skip it
Skip it if photons per watt is the metric that matters. At 50 umol/s from 36 W it is the least efficient fixture on this page, and much of the price is industrial design.
AC Infinity IONBOARD S22
LED panelA big mature plant
The highest published efficacy of any fixture here at 2.7 umol/J, on Samsung LM301H diodes, with dimming in real 20% steps rather than a vague knob.
What AC Infinity publishes
- Power draw
- 115 W (source)
- Efficacy
- 2.7 umol/J (source)
- PPFD
- 1098 PPFD (no measurement distance published) (source)
- Stated coverage
- 2 x 2 ft (source)
- Spectrum
- Samsung LM301H, plus 660 nm, 730 nm, 3000 K, 6500 K (source)
- Diodes
- 272 diodes (source)
- Dimming
- Yes, 0-100% in 20% increments (source)
- Dimensions
- 30.0 x 30.0 cm board, 1.1 cm thick (source)
- Rated life
- 50,000 hours (source)
Our arithmetic
- Photon output implied by the published wattage and efficacy: about 311 umol/s
115 W x 2.7 umol/J = 310.5 umol/s. AC Infinity does not print PPF directly, so this is our arithmetic from two figures it does print.
What AC Infinity does not publish
- PPF in umol/s — only efficacy is given, so photon output has to be derived
- The measurement distance for the 1098 PPFD figure, without which the number cannot be compared to anything
Who should skip it
Skip it if you want to place it by the numbers. AC Infinity prints 1098 PPFD with no measurement distance attached, which makes that figure impossible to use or compare.
Questions people actually ask
+How much light does a monstera need?
+Will a grow light make my monstera fenestrate?
+How far should a grow light be from a monstera?
+Can a monstera live in a dark corner?
Sources
- Iowa State University Extension — Important Considerations for Providing Supplemental Light to Indoor Plants — consulted September 2, 2026
- University of Minnesota Extension — Lighting for indoor plants and starting seeds — consulted September 2, 2026
- SANSI — BR30 36W grow light bulb product page — consulted September 2, 2026
- AC Infinity — IONBOARD S22 published specifications — consulted September 2, 2026
Read next
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The Best Grow Lights for Large Indoor Plants
Height, not brightness, is the constraint on a big plant. Published PPFD-at-distance figures are what decide it.
Houseplants
The Best Grow Lights for Indoor Plants
Sized to a 3-10 mol/m2/day houseplant target rather than a grow-tent target, with running cost for each.
Where this sits
This page belongs to Grow Lights for Houseplants and Winter. 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.