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Sprout & Spectrum

Grow Lights for Philodendrons

One genus, two completely different answers. The plain green vines barely notice a fixture; the variegated cultivars people pay for depend on one.

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

Close-up of a philodendron leaf showing its heart shape in a potted setting

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 thin aluminum LED grow board above a row of potted houseplants
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.
Variegated, dimmed exactly2.7 umol/J
2
A screw-in LED grow bulb in a desk lamp aimed at a potted houseplant
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, one lamp1.82 umol/J (ours)
3
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.
A trailing heartleafNot published

The reasoning

“Philodendron” covers plants with almost nothing in common as far as light goes. A trailing heartleaf in a hanging basket is one of the most forgiving plants you can own. A pink princess, a white knight, a Florida ghost — the variegated cultivars that cost real money — are among the most light-sensitive. Treating them the same is how people end up with an expensive plant that has gone plain green.

The two halves of the genus

How common philodendrons split on light, and why
TypeExamplesPublished bandBenefit from a fixture
Plain green viningHeartleaf, Brasil (mildly variegated), micansLow (50–150 µmol/m²/s)Marginal — these tolerate low light well
Plain green upright / large-leafSelloum, xanadu, birkinLow–medium (100–200)Worthwhile — bigger leaves and tighter growth at the top of the range
Heavily variegated cultivarsPink princess, white knight, Florida ghost, ring of fireMedium (150–250)Transformative — the variegation itself depends on it
Why variegated philodendrons need more light than plain ones
Less chlorophyll

Pink, white and cream tissue cannot photosynthesize. A leaf that is half variegated is doing the work of half a leaf, so the plant needs proportionally more light to break even — and in too little, it reverts toward green.

The variegated problem, specifically

A pink princess philodendron is bought for the pink. The pink is tissue without chlorophyll. When the plant is short of light it does the sensible thing and grows greener leaves, because green tissue is what keeps it alive — so the pink fades, new leaves come in mostly green, and the plant slowly reverts to something that looks like its cheaper relative.

The reverse is also true, and it is the thing worth paying for a fixture over: steady light at the top of the medium band is what keeps new growth variegated. That is the entire argument, and it is a stronger one than for almost any other plant on this site — a $5 heartleaf is fine in a corner; a $100 cultivar going green is a loss you can prevent for a few dollars a month.

Sizing for each half

Required PPF (µmol/s) = target PPFD × area (m²) ÷ uniformity
One plant in a 1 × 1 ft footprint

Area = 0.093 m².

Plain heartleaf, 100 µmol/m²/s: 100 × 0.093 ÷ 0.8 = 12 µmol/s. Almost nothing — a clip light covers it.

Variegated cultivar, 200 µmol/m²/s: 200 × 0.093 ÷ 0.8 = 23 µmol/s. A single bulb covers it with margin.

A shelf of six variegated plants, 2 × 3 ft: 200 × 0.557 ÷ 0.8 = 139 µmol/s. About half a 100 W panel.

Placement, computed

SANSI publishes light density with a stated distance — 265.58 µmol/m²/s at 1 ft — so a bulb can be placed on paper:

SANSI BR30 distance by philodendron type, scaled from its published 1 ft figure
DistancePPFD (µmol/m²/s)Suits
12 in265.58 (published)Too much for any philodendron — bleaching risk on variegated tissue
14 in~195Variegated cultivars — top of the medium band
18 in~118Upright and large-leaf types
24 in~66Plain heartleaf, if it needs anything at all

Two cautions for variegated plants. First, the pale tissue bleaches more easily than green, so the top of the medium band is the target — not the high band. Second, step a plant up gradually; leaves grown at 60 µmol/m²/s will scorch if moved straight to 250.

Why a dimmable fixture earns its place here

A variegated philodendron sits in a narrow window: enough light to keep the variegation, not so much that the pale tissue burns. That is exactly the case for dimming you can repeat. AC Infinity publishes 0 to 100% in 20% increments — five defined positions — so “60% in winter, 40% in summer” is a setting you can write down and return to. An unmarked knob is not.

The full case for repeatable dimming is in the best dimmable grow lights.

The picks, with their real limits

  • AC Infinity IONBOARD S22 — for a shelf of variegated plants. 2.7 µmol/J on Samsung LM301H diodes, 20% dimming steps, passively cooled, mounts flat. Con: it publishes a 1098 PPFD figure with no measurement distance, which makes that number unusable, and it publishes no PPF directly — its ~311 µmol/s is our arithmetic.
  • SANSI 36W BR30 — for one plant, in a lamp you own. The only bulb we cover you can place by arithmetic. Con: 1.82 µmol/J is a third less efficient than a panel, and it lights one pot.
  • GooingTop clip light — for a trailing heartleaf in a hanging basket, where a gooseneck reaches and a lamp does not. Con: no manufacturer spec sheet at all; nothing about its output can be computed or compared.

Hours and cost

Twelve to fourteen hours. Iowa State University Extension suggests 12 to 14 generally with 16 as a ceiling.

Running cost for a variegated philodendron

One SANSI bulb: 36 W × 12 h ÷ 1000 = 0.432 kWh a day = 12.96 kWh a month = $2.38.

An AC Infinity board at roughly 60%: about 69 W × 12 h ÷ 1000 = 0.83 kWh a day = 24.8 kWh a month = $4.55.

Either is a fraction of what the plant it protects cost.

The honest summary

A plain heartleaf philodendron in a room with a window needs nothing from this page. A variegated cultivar needs steady light at the top of the medium band to stay variegated, and that is one of the clearest cases for a fixture on this entire site — the alternative is watching the thing you paid for fade. Size small, dim precisely, keep it at 14 inches, and step it up gently.

Every pick in full

A thin aluminum LED grow board above a row of potted houseplants
01

AC Infinity IONBOARD S22

LED panel

Variegated, dimmed exactly

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.

A screw-in LED grow bulb in a desk lamp aimed at a potted houseplant
02

SANSI 36W BR30 Grow Light Bulb

Grow bulb

One plant, one lamp

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.

A gooseneck clip-on grow light clamped to a shelf beside a small houseplant
03

GooingTop Clip Grow Light

Clip light

A trailing heartleaf

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

+Do philodendrons need grow lights?
Plain green ones usually do not — heartleaf and similar vines tolerate low light and sit inside the published low band in any room with a window. Heavily variegated cultivars like pink princess and white knight almost always benefit, because their pale tissue cannot photosynthesize and they revert toward green when light is short.
+Why is my pink princess losing its pink?
Insufficient light. Pink tissue has no chlorophyll, so a plant that is short of light grows greener leaves to keep itself alive. Steady light at the top of the medium band — around 200 µmol/m²/s — keeps new growth variegated, though leaves that have already gone green stay green.
+How close should a grow light be to a variegated philodendron?
About 14 inches from a SANSI BR30, which scales its published 265.58 µmol/m²/s at 1 ft to roughly 195. Closer than that risks bleaching the pale tissue, which burns more easily than green. Step a plant up over two to three weeks if it has been in low light.
+Is a dimmable light worth it for philodendrons?
For variegated ones, yes. They sit in a narrow window between keeping their variegation and bleaching, and a fixture with stated dimming steps lets you set that level and return to it exactly. AC Infinity publishes 20% increments; most other fixtures we cover offer only an unmarked knob.
+Have you grown philodendrons under these lights?
No. We have not owned or measured any fixture on this site and have grown nothing under them. Every figure is published by the manufacturer or an extension service with a link, or computed from those figures with the arithmetic shown.

Sources

Read next

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.