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LumenLeaf: PPFD Grow Light for iPhone

LumenLeaf: PPFD Grow Light uses a phone to estimate PAR/PPFD, DLI, lux, foot-candles and color temperature where plants actually sit. Pick the light source, make the guided printer-paper diffuser, measure at plant height, and enter the photoperiod to turn a reading into DLI. It labels sunlight, white LED, HPS, CMH, fluorescent and mixed-light readings separately, so a grower can compare conditions for herbs, houseplants, microgreens or a grow tent. The key distinction is measurement mode: compatible phones use the rear camera in RAW mode, while phones without RAW support fall back to an explicitly marked ambient-light-sensor estimate. It is therefore a phone-based estimate, not a replacement for a calibrated dedicated PAR meter.

Get the app — App Store

At a glance

Platforms
iPhone
Price
Free
Category
Utilities
No ads
✓
No tracking
✓
Works offline
✓
Last verified
2026-07-29
Minimum OS
14.0
Version
1.0
Released
2026-05-27

What is it?

LumenLeaf: PPFD Grow Light is an app for PAR, PPFD, DLI, illuminance, and color-temperature readings for indoor growing.

What problem does it solve?

Plants can look underlit or overlit long before a grower knows how much usable light reaches them. LumenLeaf turns readings into PPFD and DLI and clearly distinguishes camera readings from ambient-sensor estimates.

What it can do

  • PPFD in µmol/m²/s — real-time photon flux density
  • DLI in mol/m²/d — daily light integral with photoperiod input
  • Lux and foot-candle illuminance
  • Color temperature in Kelvin (CCT)
  • Per-light-source readings: Sunlight, White LED, HPS, CMH, Fluorescent, Mixed
  • 100% free — every feature, every plant preset, no paywalls
  • No account, no email, no sign-up
  • Works fully offline

Screenshots

Split feature view introducing plant light measurement tools
Split feature view showing companion plant light tools
Daily light integral measurement for a growing area
Plant library with light requirements for different plants
Light target screen for setting a plant’s daily goal

How to use it

Choose the light-source type, follow the visual guide to make the paper diffuser, then measure at plant level. Enter the photoperiod to see DLI and use the stated measurement mode when interpreting a reading.

Who it is for

Houseplant keepers, herb and microgreen growers, hydroponic hobbyists, and grow-tent users.

Privacy and permissions

You can find the permissions an app may request in its store listing and on its support page. The linked legal pages explain how the app handles data and the privacy choices it provides.

FAQ

Does LumenLeaf: PPFD Grow Light include PPFD in µmol/m²/s — real-time photon flux density?

LumenLeaf: PPFD Grow Light lists this feature in its store description: PPFD in µmol/m²/s — real-time photon flux density

How does LumenLeaf: PPFD Grow Light handle DLI in mol/m²/d — daily light integral with photoperiod input?

LumenLeaf: PPFD Grow Light lists this feature in its store description: DLI in mol/m²/d — daily light integral with photoperiod input

What can LumenLeaf: PPFD Grow Light do with Lux and foot-candle illuminance?

LumenLeaf: PPFD Grow Light lists this feature in its store description: Lux and foot-candle illuminance

When is Color temperature in Kelvin (CCT) useful in LumenLeaf: PPFD Grow Light?

LumenLeaf: PPFD Grow Light lists this feature in its store description: Color temperature in Kelvin (CCT)

Can I use LumenLeaf: PPFD Grow Light for Per-light-source readings: Sunlight, White LED, HPS, CMH, Fluorescent, Mixed?

LumenLeaf: PPFD Grow Light lists this feature in its store description: Per-light-source readings: Sunlight, White LED, HPS, CMH, Fluorescent, Mixed