The Best Grow Lights for Indoor Plants
Houseplants need far less light than the internet implies. These picks are sized to what they actually want, not to a tent.
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 plant, no new fixture | 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 you look at | 1.39 umol/J (ours) | |
| 3 |  Barrina T5 4ft Grow Light Strips The default seed-starting bar for good reasons — 4 ft long, linkable in series, cheap per foot — and the reason we built a coverage calculator, because Barrina publishes no photon data whatsoever. | A whole shelf of plants | Not published | |
| 4 |  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 dense plant corner | 2.7 umol/J | |
| 5 |  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. | A desk plant, minimum spend | Not published |
The reasoning
Search for a houseplant grow light and you will mostly find fixtures designed for a grow tent. They are excellent products aimed at a different problem: a dense canopy of high-light crops in an enclosed space. Put one over a monstera in a living room and you have bought three times the light the plant can use, a fan you can hear, and a corner that looks like a facility.
Iowa State University Extension puts low-light foliage houseplants at 3 to 6 mol per square meter per day, foliage and flowering houseplants at 6 to 10, and flowering houseplants, succulents and leafy herbs at 12 to 16. Those are the numbers this list is sized against.
Iowa State University Extension. A seed tray wants about 12; a fruiting tomato wants 20 to 30. Houseplants sit at the bottom of the range, which is why a modest fixture usually wins.
How we picked
We have not tested any of these. Every figure below is either quoted from the manufacturer’s published specification with a link, or divided out by us with the working shown. Three criteria decided the order:
- Right-sized rather than maximal. A fixture that delivers 700 µmol/m²/s to a pothos is not a better fixture, it is a more expensive one that costs more to run.
- It has to be tolerable in a room you live in. This is the criterion grow-tent reviews ignore entirely, and it is decisive for houseplants. Magenta light, audible fans and industrial housings are real costs.
- A published photon figure, where one exists. Of these five, three publish photon output; two publish none at all. We say which on every page they appear.
Working out what your plant needs
PPF needed = PPFD × your area (m²) ÷ uniformity
Target 8 mol/m²/day, running 12 hours a day.
PPFD = 8 × 1,000,000 ÷ (12 × 3600) = 185 µmol/m²/s.
A 2 × 2 ft area is 0.372 m². 185 × 0.372 = 69 µmol/s landing on the plant; at 0.8 uniformity the fixture needs to produce about 86 µmol/s.
The SANSI BR30 publishes 65.6 µmol/s — just short over that full area, and comfortably sufficient if the plant occupies the middle foot of it rather than the whole table. That is the kind of distinction a wattage figure cannot make.
Efficiency, and where it stops mattering
For houseplants the light runs for months rather than weeks, so efficacy matters more here than it does for seed starting. The spread across these picks is wide:
| Fixture | Efficacy | Cost/month at 12 h |
|---|---|---|
| AC Infinity IONBOARD S22 (115 W) | 2.7 µmol/J | $7.60 |
| SANSI 36W BR30 (36 W) | 1.82 µmol/J (ours) | $2.38 |
| Soltech Aspect Gen 2 (36 W) | 1.39 µmol/J (ours) | $2.38 |
| Barrina T5, 4 × 20 W (80 W) | Not published | $5.28 |
| GooingTop clip (about 10 W) | Not published | $0.66 |
Cost figures are computed at the US residential average of 18.34 cents per kWh (EIA, June 2026) — put your own tariff into the cost calculator. Note that the efficient fixture costs the most to run here, because it draws three times the power: efficacy tells you photons per watt, not dollars per month.
The honest verdict on the expensive one
Soltech’s Aspect Gen 2 publishes 50 µmol/s from 36 W, which computes to 1.39 µmol/J — the least efficient fixture we have specs for anywhere on this site. It is also the only one you would willingly hang above a sofa, and it publishes PPFD at three separate distances so you can actually place it, which almost nobody else does.
Both things are true. If the fixture has to live in a room you look at, the design premium is a real thing you are buying and the efficiency penalty works out to a couple of dollars a month. Just buy it knowing which one you are paying for.
What we could not tell you
Neither Barrina nor GooingTop publishes any photon data — no PPF, no PPFD, no efficacy. Both are on this list because the form factors are genuinely useful and the prices are low, but nothing about their output can be checked before you buy. If that matters to you, the SANSI bulb is the cheapest fixture here whose output is published.
For the season-specific version of this problem, see the best grow lights for winter, and for plant-by-plant targets, PPFD targets by plant type.
Every pick in full
SANSI 36W BR30 Grow Light Bulb
Grow bulbOne plant, no new fixture
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 you look at
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.
Barrina T5 4ft Grow Light Strips
LED barA whole shelf of plants
The default seed-starting bar for good reasons — 4 ft long, linkable in series, cheap per foot — and the reason we built a coverage calculator, because Barrina publishes no photon data whatsoever.
What Barrina publishes
- Power draw
- 20 W per fixture; an 8-pack draws 160 W (source)
- Spectrum
- 5000 K (source)
- Dimming
- No; on/off switch per fixture, linkable up to 8 in series (source)
- Dimensions
- 4 ft strip, 120-degree beam angle, 120 V AC (source)
What Barrina does not publish
- PPF in umol/s — for any strip in the range
- PPFD at any stated distance
- Photon efficacy in umol/J
- LED count per strip, and rated lifespan
Who should skip it
Skip it if you need to know what you are getting before it arrives. There is no published PPF, no PPFD and no efficacy figure, so nothing about its output can be verified in advance.
AC Infinity IONBOARD S22
LED panelA dense plant corner
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.
GooingTop Clip Grow Light
Clip lightA desk plant, minimum spend
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.
Questions people actually ask
+How much light do indoor plants need?
+Do I need a special grow light for houseplants?
+How many hours should a houseplant grow light be on?
+Is an expensive designer grow light worth it?
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
- Soltech — Aspect Gen 2 published specifications — consulted September 2, 2026
- AC Infinity — IONBOARD S22 published specifications — consulted September 2, 2026
- Barrina — T5 ML20 4ft 20W product page — consulted September 2, 2026
- US Energy Information Administration — Electric Power Monthly, Table 5.3 (US residential average, June 2026) — consulted September 2, 2026
Read next
Houseplants
How Much Light Do Houseplants Need in Winter?
Published DLI bands by plant type, and how to work out what your winter window is short by.
Houseplants
The Best Grow Lights for Winter
Winter is a daily-total problem. Modest fixture, long photoperiod — sized against published targets and costed for the season.
Coverage & Sizing
PPFD Targets by Plant Type
Published light bands mapped to common indoor plants, with the DLI each implies.
Running Cost
The Cost to Run a Grow Light All Winter
Five setups priced for a full winter season, from a clip light to a three-shelf rack.
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.