PAR Meter: Grow Light PPFD DLI
Measure plant light for growth
Free · In‑App Purchases
Measure grow light as PPFD and DLI and get lighting recommendations for your plants.
Is your plant getting enough light? PAR Meter tells you in seconds.
It measures the light your plants actually use, as PPFD right now and as DLI over the whole day. Pick your plant type and the gauges show green, yellow or red, together with advice on what to do.
WHAT YOU GET
• PPFD in µmol/m²/s, the light at the canopy right now
• DLI in mol/m²/day, the total light per day for your light period
• A recommended band on the gauges for your plant type
• Clear advice: move the lamp, dim it, or change the hours
• Lux and foot-candles as well
PLANT TYPES
Houseplants, orchids, succulents, seedlings, cuttings, microgreens, leafy greens, herbs, root vegetables, fruits and berries, fruiting vegetables, and high light plants in the vegetative and flowering stages. Each with its recommended light range.
WORKS WITH ANY LIGHT
LED grow lights, daylight, household LED, fluorescent, HPS, MH and CMH, or your own µmol per lux factor. The right light source type is what makes the reading accurate.
MADE FOR GROWERS
• Logarithmic gauge, precise both on a dim windowsill and under a strong lamp
• Hold button to freeze the reading before you take the phone out from the plants
• Save measurements with time and comments, and re-read them for another plant or light period
• Calibration for even better accuracy
HOW TO USE
Hold a white paper at the top of your plants, facing the light, and point the camera at it. Set your light period per day to get the DLI, and select the plant type for recommendations.
WHY IT MATTERS
Plants do not grow on lux. They grow on PAR, the light between 400 and 700 nm that photosynthesis can use. Too little gives pale, stretched growth. Too much wastes electricity and burns leaves. Measuring lets you hang your lamp at the right height, find the dark corners, and compare lamps.
FREE TO USE
Measuring PPFD, DLI and lux under daylight and white LED is free, with no time limit and no ads. The other light source types, saving measurements and calibration are available with a one-time fee or subscription, still at a fraction of the cost of a dedicated PAR meter.
Privacy Policy, https://contechity.com/par-meter/pp.html
End User License Agreement, https://contechity.com/par-meter/eula.html
DEDICATED SUPPORT
Your feedback helps improve the app. Contact us at apps@contechity.com for support or suggestions.
Turn your phone into a grow light meter today and give your plants the light they need.
Ratings & Reviews
• Misc minor improvements.
This is a new app. Please let us know what you think in a review!
The developer, Contechity AB, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Not Linked to You
The following data may be collected but it is not linked to your identity:
- Purchases
- Identifiers
- Usage Data
- Diagnostics
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- Contechity AB
- Size
- 45 MB
- Category
- Utilities
- Compatibility
Requires iOS 15.0 or later.
- iPhone
Requires iOS 15.0 or later. - iPad
Requires iPadOS 15.0 or later. - iPod touch
Requires iOS 15.0 or later. - Apple Vision
Requires visionOS 1.0 or later.
- iPhone
- Languages
English and 39 more
- English, Afrikaans, Bulgarian, Catalan, Croatian, Czech, Danish, Dutch, Estonian, Filipino, Finnish, French, German, Greek, Hindi, Hungarian, Icelandic, Indonesian, Italian, Japanese, Korean, Latvian, Lithuanian, Malay, Norwegian Bokmål, Polish, Portuguese, Romanian, Russian, Serbian, Simplified Chinese, Slovak, Slovenian, Spanish, Swedish, Thai, Traditional Chinese, Turkish, Ukrainian, Vietnamese
- Age Rating
4+
- 4+
- In-App Purchases
Yes
- Full Access (Month) $1.99
- Full Access (Lifetime) $20.00
- Copyright
- © 2026 Contechity