# Grow Light Meter: PPFD — PAR, DLI & PPFD Light Meter

> PAR, DLI & PPFD Light Meter (iPhone/iPad app by heekyung moon.)

- Source: https://appshunter.io/ios/app/grow-light-meter-ppfd/id6784830058 (this page in markdown: same URL + `.md`)
- Developer: [heekyung moon](https://appshunter.io/developer/6779193748)
- Category: Utilities
- Price: Free
- Age rating: 17+
- Requires: iOS 16.4 · 67 MB
- Languages: American English
- Released: 2026-07-02
- Data updated: 2026-09-10
- User reviews in markdown: https://appshunter.io/ios/app/grow-light-meter-ppfd/id6784830058/reviews.md

## What is Grow Light Meter?

Are your plants getting enough light? Grow Light Meter turns your phone into a simple light meter for indoor gardening, so you can check whether a windowsill, shelf or grow light is bright enough for your plants to thrive.

Point your phone at the spot where a plant sits and get an instant reading of light intensity, estimated in PPFD (the light plants actually use), with PAR and a daily DLI estimate so you know how much light your plants receive over a full day.

WHAT YOU GET

• PPFD reading — see the photosynthetic photon flux density at plant level, the number that really matters for growth.
• PAR & lux — view photosynthetically active radiation and raw lux side by side.
• DLI estimate — turn light intensity plus your daily light hours into a Daily Light Integral, the total light your plant gets each day.
• Plant targets — compare your reading against typical needs for low-light foliage, houseplants, herbs, seedlings and high-light fruiting crops.
• Find the bright spots — sweep around a room to discover where light is strong and where plants will struggle.

WHO IT'S FOR

Houseplant lovers, indoor gardeners, hydroponics and grow-tent growers, seed starters, and anyone setting up LED grow lights who wants to place plants and lamps with confidence.

A NOTE ON ACCURACY

Readings are an estimate from your phone's ambient light sensor and camera, not a lab-grade quantum PAR meter. Use them to compare spots, position grow lights and spot dark corners — not for precise scientific calibration. Results vary by device.


## Version history (last 5 releases)

### 1.0.10 — 2026-08-06

Alerts now arrive properly on Android instead of landing silently, and the app no longer interrupts you in the middle of what you came to do.

### 1.0.9 — 2026-08-01

Thanks for using our app! This update brings behind-the-scenes performance and stability improvements for a smoother, more reliable experience. Your support means the world to us.

### 1.0.8 — 2026-07-30

Thanks for using our app! This update brings behind-the-scenes performance and stability improvements for a smoother, more reliable experience. Your support means the world to us.

### 1.0.7 — 2026-07-28

Thanks for using our app! This update brings behind-the-scenes performance and stability improvements for a smoother, more reliable experience. Your support means the world to us.

### 1.0.6 — 2026-07-28

Thanks for using our app! This update brings behind-the-scenes performance and stability improvements for a smoother, more reliable experience. Your support means the world to us.

## More apps by heekyung moon

- [Blur & Mosaic Privacy](https://appshunter.io/ios/app/blur-and-mosaic-privacy/id6779193648)
- [Aurora Northern Lights](https://appshunter.io/ios/app/aurora-northern-lights/id6779193746)
- [Golden Hour Sun Tracker](https://appshunter.io/ios/app/golden-hour-sun-tracker/id6779194270)
- [GIF Maker & Editor Studio](https://appshunter.io/ios/app/gif-maker-and-editor-studio/id6779194430)
- [Slow Shutter Long Exposure](https://appshunter.io/ios/app/slow-shutter-long-exposure/id6780141566)
- [Rain Alert Nowcast](https://appshunter.io/ios/app/rain-alert-nowcast/id6780142286)

All apps by heekyung moon: https://appshunter.io/developer/6779193748

## Related topics

[grow light meter](https://appshunter.io/ios/topics/grow-light-meter) · [biotic plant light meter](https://appshunter.io/ios/topics/biotic-plant-light-meter) · [ppfd free](https://appshunter.io/ios/topics/ppfd-free)

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-09-10.*