Best Photon Light Meter Apps

250+ iOS apps curated and reviewed

4.1 avg rating
17 free apps
Updated October 2026

Finding the right photon light meter apps can be overwhelming with so many options. We've analyzed 250+ apps to bring you the best choices for 2026, from free options to premium solutions with advanced features.

Compare top Photon Light Meter Apps (October 2026)

#AppPriceRatingAdsIn-App PurchasesUpdated
1Photone - Grow Light MeterPhotone - Grow Light MeterFree4.6★ (5K)NoYesNov 2026
2Candela: Light MeterCandela: Light MeterFree2.0★ (1)NoNoOct 2026
3Light Meter LM-3000Light Meter LM-3000Free4.5★ (2.6K)NoYesOct 2026
4Lux Light Meter & PhotometerLux Light Meter & PhotometerFree4.8★ (198)YesYesOct 2026
5Light Meter: Lux-525 ProLight Meter: Lux-525 ProFree4.5★ (116)NoYesOct 2026
6LUX Meter - Light MeterLUX Meter - Light MeterFree4.2★ (10)NoNoOct 2026
7Light Meter.Light Meter.Free—NoYesMay 2026
8LuxMeter - Light & EV MeterLuxMeter - Light & EV MeterFree—NoNoOct 2026

Top Picks for Photon Light Meter

Photone - Grow Light Meter#1

Photone - Grow Light Meter by Lightray Innovation GmbH

Measure plant light: PAR, PPFD
Editor's Choice
🔧 Utilities
4.6😐(5K ratings)
FreeIn-App Purchases
Photone - Grow Light Meter screenshot 1
Photone - Grow Light Meter screenshot 2
Photone - Grow Light Meter screenshot 3
Photone - Grow Light Meter screenshot 4
Photone - Grow Light Meter screenshot 5
Photone - Grow Light Meter screenshot 6

This app acts as a professional-grade light meter for plants, measuring PAR, PPFD, DLI, and more using your device's camera. It helps optimize plant lighting by providing accurate readings and in-app guides, with optional advanced features available through purchase.

What We Love

  • 🚀 Accurate readings
  • 💡 Helpful for growing plants
  • 👍 Easy to use
  • 🚀 Saves money compared to expensive meters
  • 👍 Useful for adjusting lighting

Room to Improve

  • 🐛 Inconsistent readings
  • 💰 Expensive in-app purchases
  • 🔒 Requires additional equipment (diffuser) to work properly
  • 🐛 Readings not accurate without calibration
  • 🔒 Limited functionality in free version
Candela: Light Meter#2

Candela: Light Meter by Snizhana Babytska

Lux, EV & plant light meter
Strong Contender
🔧 Utilities
2.0(1 ratings)
Free
Candela: Light Meter screenshot 1
Candela: Light Meter screenshot 2
Candela: Light Meter screenshot 3
Candela: Light Meter screenshot 4

This utility app transforms your iPhone camera into a versatile light meter. It provides real-time readings for illuminance, exposure value, and color temperature, catering to photography, plant care, and room lighting needs. The app prioritizes user privacy with on-device processing and no data collection.

Light Meter LM-3000#3

Light Meter LM-3000 by Lightray Innovation GmbH

Simple & accurate measurement!
Worth Considering
🔧 Utilities
4.5😐(2.6K ratings)
FreeIn-App Purchases
Light Meter LM-3000 screenshot 1
Light Meter LM-3000 screenshot 2
Light Meter LM-3000 screenshot 3
Light Meter LM-3000 screenshot 4

Transform your smartphone into a professional light meter. Measure illuminance and color temperature with scientifically validated accuracy, trusted by professionals. Requires a simple diffuser for precise readings.

What We Love

  • 👍 Great app
  • 👍 Accurate measurements
  • 👍 Easy to use
  • 👍 Helpful customer service
  • 👍 Useful for science/research

Room to Improve

  • 🐛 Requires diffuser for accurate readings
  • 💰 Expensive for a light meter app
  • 🔋 Battery/trial period issues
  • 🔍 Inconsistent/inaccurate readings
  • 🙄 Misleading/deceptive marketing

More Photon Light Meter apps to explore

FAQ about Photon Light Meter

What are the best photon light meter apps for iPhone?
Photone - Grow Light Meter tops our photon light meter apps ranking as of October 2026, with a 4.6-star average from 5K App Store ratings, and it's free to download.
Yes — 17 of the top photon light meter apps we rank are free to download, including Photone - Grow Light Meter and Candela: Light Meter.
Photone - Grow Light Meter has no ads and offers in-app purchases, according to its App Store listing as of October 2026.
We track 250+ photon light meter apps on the iOS App Store as of October 2026, ranked by rating, recency, and analysis of real user reviews.