Grow Lights for Fiddle Leaf Figs
The most-returned houseplant in America drops its leaves for a reason that is almost always light. Here is the arithmetic for a plant that is six feet tall.
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.
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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 |  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. | A full-size canopy | 2.3 umol/J | |
| 2 |  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. | A younger plant | 2.5 umol/J | |
| 3 |  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, honestly | 1.39 umol/J (ours) |
The reasoning
The fiddle leaf fig has a reputation for being difficult, and most of that difficulty is one problem wearing several costumes. It drops leaves in winter. It drops leaves after you move it. It grows lopsided. It stops growing for months. Underneath all four is the same thing: a plant that evolved for a lot of light, kept in a room that supplies a fraction of it.
What makes it harder than a pothos is not the band it sits in. It is that a fiddle leaf fig is a canopy, not a pot — often five or six feet tall with leaves the size of dinner plates — and lighting a volume is a different problem from lighting a surface.
µmol/m²/s — the top of University of Minnesota Extension's medium band into the bottom of high. Well above a typical room, which is why the plant declines indoors every winter.
Why it drops leaves in winter
A fiddle leaf fig shedding lower leaves between November and March is almost always responding to the collapse in daily light. The plant cannot support the leaf area it grew in summer on the light it receives in January, so it sheds from the bottom. Moving it closer to the glass helps; a fixture stops it.
A mature plant occupies roughly 3 × 3 ft = 9 sq ft = 0.836 m².
At 250 µmol/m²/s: 250 × 0.836 ÷ 0.8 = 261 µmol/s required.
Spider Farmer SF1000: 249.21 µmol/s published — just under. Mars Hydro TS 1000: 343 µmol/s published — comfortable.
One TS 1000 over that canopy computes to 343 ÷ 0.836 × 0.8 = 328 µmol/m²/s at the top — the high band, and more than enough to hold every leaf through winter.
The tall-plant problem
Area math assumes a flat plane. A fiddle leaf fig is a vertical stack of leaves, and light density falls with roughly the square of distance, so the lower canopy receives far less than the top. A fixture 18 inches above the crown might be 5 feet from the bottom leaves.
Suppose the top leaves sit 18 in (1.5 ft) from the fixture and the lowest leaves 4.5 ft — a 3 ft tall canopy.
Ratio of distances: 4.5 ÷ 1.5 = 3. Intensity at the bottom ≈ top ÷ 3² = top ÷ 9.
If the top receives 328 µmol/m²/s, the bottom leaves receive something on the order of 36 — below the floor of the low band. This is why the lower leaves go first, even under a fixture.
Three practical responses, in order of cost:
- Rotate the pot a quarter turn weekly so no side is permanently the poor relation. Free, and it also prevents the lopsided lean.
- Hang the fixture higher than feels right — 24 to 36 inches above the crown. You lose some intensity at the top and gain far more evenness down the sides.
- Place the fixture to the side rather than directly overhead, angled at the mid-canopy, if you have a second one or a wall bracket. This is the only way to genuinely light the lower half.
The fixtures, and their honest limits
| Fixture | Published output | Over a 3 × 3 ft canopy | The catch |
|---|---|---|---|
| Mars Hydro TS 1000 | 343 µmol/s, 150 W, 2.3 µmol/J | About 328 µmol/m²/s at the top — holds a full canopy through winter | No PPFD published at any distance; 150 W is the highest draw we cover |
| Spider Farmer SF1000 | 249.21 µmol/s, 100 W, 2.5 µmol/J | About 238 µmol/m²/s — right for a younger or smaller plant | Just short of the 261 µmol/s a mature canopy asks for; no PPFD at distance |
| Soltech Aspect Gen 2 | 50 µmol/s; about 50 µmol/m²/s at 1 m | A supplement only — about the low-band floor at a meter | The least efficient fixture we cover at 1.39 µmol/J; will not stop winter leaf drop on its own |
The Soltech deserves a plain word, because it is the fixture people want for this plant — it is the only one you would hang in the living room a fiddle leaf fig usually lives in. Its published numbers say what it is: a pendant delivering the bottom of the low band at a meter. Over a fiddle leaf fig it is a top-up beside a window, not a solution in a dark corner. We would rather say that than sell it as one.
Running cost
150 W × 12 h ÷ 1000 = 1.8 kWh a day.
Over 182 days: 327.6 kWh. At 18.34 cents per kWh: $60.08 for the season, about $10 a month.
The SF1000 at 100 W comes to about $40.05 for the same period.
That is the most expensive plant on this site to light apart from citrus, and it is roughly the price of one replacement plant. Price your own tariff in the running-cost calculator.
Acclimating a plant that has been in low light
A fiddle leaf fig that has spent a winter at 60 µmol/m²/s has grown leaves for that level. Moving it straight under 328 can bleach them. Step it up over two to three weeks — a dimmable fixture makes this a knob turn; otherwise start the light higher and lower it weekly.
Signs, and what they mean
- Lower leaves dropping in winter: light. Add a fixture or move it to the glass.
- Leaning hard to one side: light from one direction. Rotate weekly.
- New leaves smaller than old: a sustained light deficit.
- Brown spots spreading from the center of leaves: usually overwatering and root trouble, not light. A fixture will not fix it and may dry the pot faster, which can help or hurt.
- Leaf drop right after a move: relocation shock. Give it a few weeks before changing anything else.
The honest summary
If your fiddle leaf fig sheds every winter, one real panel — hung 24 to 36 inches above the crown, on a 12-hour timer, with the pot rotated weekly — stops it, for about $40 to $60 a season. The lower canopy will still receive a fraction of the top unless you light from the side. And the pendant that looks right in the room is a supplement, not a fix. Related sizing for other large plants is in the best grow lights for large indoor plants.
Every pick in full
Mars Hydro TS 1000
LED panelA full-size canopy
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.
Spider Farmer SF1000
LED panelA younger plant
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.
Soltech Aspect Gen 2
PendantA living room, honestly
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.
Questions people actually ask
+Do grow lights work for fiddle leaf figs?
+How far should a grow light be from a fiddle leaf fig?
+Will a decorative pendant grow light keep my fiddle leaf fig alive?
+Why does my fiddle leaf fig drop leaves in winter?
+Have you grown a fiddle leaf fig under these lights?
Sources
- University of Minnesota Extension — Lighting for indoor plants and starting seeds — consulted September 2, 2026
- Mars Hydro — TS 1000 published specification table — consulted September 2, 2026
- Spider Farmer — SF1000 published specification table — consulted September 2, 2026
- Soltech — Aspect Gen 2 published specifications — consulted September 2, 2026
- US Energy Information Administration — Electric Power Monthly, Table 5.3 (US residential average, June 2026) — consulted September 2, 2026
- Iowa State University Extension — Important Considerations for Providing Supplemental Light to Indoor Plants — consulted September 2, 2026
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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.