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To judge if a plant got enough light, need to integrate a whole day's PAR.
Is the Lux Function of 4-in-1 soil moisture meters useful? No! LUX is for the human eye's vision, rather than the photons that are useful for plants.
The AH-20Plus can help you determine whether the plants have received enough photons throughout the whole day.
Different plants, different stages of growth, require different DLI.
MattsxReviews
Reviewed in the United States on February 4, 2025
This DLI meter has been working great for me. Super easy to use, just place it where you want to monitor light and it will do the work for you. The device is quite accurate when comparing the readings with my PAR meters. The battery life is excellent as this has been running for quite some time with no signs of dying. Great value for an item that will record your readings through the coarse of the day. Plus it lets you look at the readings by the hour so you can track the whole day!
Stevie
Reviewed in the United States on February 24, 2025
I was recently given this product, the "AH-20Plus DLI Meter" for my garden and I am ready to share my experience with you. This little device is handy for measuring sunlight exposure. for all the plants in my garden. It accurately records the Daily Light Integral (DLI) for each of the last 10 days. Finally I am able to understand why some of my plants were failing in the past. THis is crucial information that ensures my plants get the right amount of light. Whether it's full sun, partial sun, partial shade, or shade, this meter gives me accurate and complete information allowing me to give my plants exactly what they need to be able to thrive which is a really big deal seeing as how I live here in Florid where there is nothing but sunshine.One of the best features is its long battery life. It runs on a single AAA battery, which is said to last for about two years. Plus, it's already set to the correct time zone, so there's no need to fiddle with settings—just turn it on and start using it right away.The AH-20Plus DLI Meter is also built to last. It's water-resistant, so you don't have to worry about rain or water sprays damaging it. It's perfect for both indoor and outdoor plants, making it a versatile tool for any gardener.Overall, I highly recommend the AH-20Plus DLI Meter. It's a reliable, easy-to-use device that helps ensure your plants get the right amount of sunlight. Whether you're a seasoned gardener or just starting out, this meter is a must-have for your gardening toolkit.
Hodor
Reviewed in the United States on February 22, 2025
I moved this to several different locations around our house and it gives accurate readings for the past 10 days. It is sturdy and easy to use, but you really need the manual to interpret the readings.
Richard
Reviewed in Canada on February 19, 2025
This is a well made light meter, with a nice display and solid housing thats powered by 1 included aaa. The battery is hard to access requiring you to unscrew 4 tiny screws, luckily the screwdriver is included. This is an inconvenience but also seems to provide good waterproofing with even the screws having silicone gaskets for water protection. Would have also preferred it to be more sensitive in low light settings with a finer unit of measurements in the low end
Mr. Anonymous
Reviewed in the United States on January 7, 2025
After having used this DLI meter for a while, overall it's a great addition to my gardening tools.The 10 day tracking is convenient if you want to see your total DLI over the last 10 days (including current), however this is where the tracking stops and then loops over old data. Not a big deal but it's limited in historical tracking (particularly with it just being a stand-alone unit).Overall build quality is good. Display is easy to see, and its functions are easy to navigate and understand. It's quite basic in this regard, which is not a bad thing.The provided plastic stake works fine, although the plastic threads will eventually wear out if you are repeatedly installing/uninstalling the stake. You may want to do this to place the unit on a plant itself, without the added weight or physical restriction of the stake.The fact that the stake is removable is great though, as if you're able and motivated, you could provide your own threaded rod to have a longer stake. The thread is 6mm with 1.0 pitch.Another thing to mention is that I did not find a way to clear the history of the DLI readings. So, if you want to move it to another plant, and want fresh recordings of DLI without the possibility of confusing the values with the meters previous placement, you'll need to remove the battery so the memory clears. I feel a reset function would be helpful in this regard.In all, its a good DLI meter, for hobby and interest-level information.
Customer B
Reviewed in the United States on January 21, 2025
I was looking forward to receiving this meter so that I could analyze the placement of all my plants and the amount of light they get. Unfortunately, the meter just doesn’t work. When I followed what little instructions that were in there, the meter did not respond. It came with a battery which was nice, but it turns on and it turns off and that’s about it. Pretty disappointing.
Gabriele & Valeria
Reviewed in Italy on January 12, 2025
Ho preso questo misuratore di luce solare per mappare alcune aree del giardino e capire quali piante possano crescerci meglio.Nella confezione sono presenti:- il dispositivo- picchetto per piantarlo in terra- batteria AAA di scorta (un'altra e' gia' inserita nel dispositivo)- un cacciavite- foglietto illustrativo (manca l'italiano)Il misuratore e' gia' pronto all'uso, puo' essere usato cosi' com'e', appoggiato su qualche superficie, oppure puo' essere avvitato sul supporto a picchetto fornito, l'importante e' che sia posizionato con la parte del display verso l'alto. E' gia' inserita una batteria, per cambiarla bisogna svitare il retro (4 viti).Di default ha impostato un orario interno relativo a non ricordo quale fascia oraria USA, quindi andrebbe impostato per il nostro fuso orario. Durante la modifica dell'ora appariranno le lettere A/P per l'impostazione dell'ora (0-12, 13-24) e la E per i minuti. Impostato l'orario si puo' mettere il misuratore nella posizione voluta ed attendere qualche giorno. Premendo il tasto blu vengono visualizzati i risultati relativi agli ultimi 10 giorni compresi quello in corso, ogni risultato si riferisce ad un arco temporale di 24h.Il numero mostrato e' in mol ("moli", rappresentano il numero di fotoni secondo una precisa formula), piu' e' alto e piu' luce solare raggiunge il punto (0-10 ombra, 10-15 ombra parziale, 15-20 sole parziale, oltre 20 assolato). Ogni tipo di pianta ha bisogno di una certa quantita' di luce, sul foglietto delle istruzioni c'e' una corposa tabella (per chi riesce a leggere scritte cosi' piccole) con l'indicazione della luce necessaria alle piante piu' comuni.Sono diversi giorni che misuro in parti diverse del giardino e i valori segnati mi sembrano coerenti.Il dispositivo e' costruito piuttosto bene, sembra di ottima qualita' anche come plastiche usate, inoltre misura in modo affidabile per cui lo ritengo uno strumento assolutamente valido ed indispensabile per scoprire il luogo migliore dove mettere a dimora le proprie piante.
Terra nova
Reviewed in Germany on December 31, 2024
Lieferung und VerpackungDas DLI-Messgerät kam pünktlich und gut verpackt und unversehrt an, wobei das Übermaß an Verpackungsmaterial allerdings negativ auffiel.HandhabungDie Einrichtung des Geräts verlief problemlos, auch wenn die Uhrzeiteinstellungen etwas verwirrend waren. Das Batteriefach ist nur mit einem Schraubenzieher zugänglich, was in der Schule durchaus praktisch ist. Die Batterien bleiben also dort, wo sie hingehören und können nicht einfach "gemopst" werden. Ein Schraubenzieher wurde mitgeliefert, für den privaten Gebrauch wäre eine benutzerfreundlichere Lösung wünschenswert gewesen.FunktionalitätWichtig ist zu wissen, dass das Gerät für den Außeneinsatz konzipiert wurde. In Innenräumen ist die Lichtausbeute so gering, dass der Sensor nicht anschlägt. Erst als es im Freien platziert wurde, wurden die gewünschten DLI-Werte angezeigt. Für den Einsatz in Innenräumen ist dies ein deutlicher Nachteil, da die Fachlehrer auch verschiedene Lichtverhältnisse in Klassenzimmern analysieren wollten. Das DLI-Messgerät funktioniert also im Freien und bei Temperaturen zwischen 0 und 50 Grad Celsius. Im Winter könnte dies jedoch problematisch werden, da es nicht für frostige Bedingungen geeignet ist. Die Messwerte sind hilfreich, um den optimalen Standort für Pflanzen zu bestimmen, aber die Tatsache, dass es in schwachem Licht nicht funktioniert, schränkt die Anwendbarkeit erheblich ein.VorteileEin klarer Vorteil des DLI-Messgeräts ist seine einfache Handhabung im Freien, wo es präzise Daten liefert. Die lange Batterielebensdauer von mindestens zwei Jahren ist ebenfalls positiv. Zudem ermöglicht das Gerät, den Lichtbedarf von Pflanzen besser zu verstehen und anzupassen.NachteileDie eingeschränkte Funktionalität in Innenräumen ist ein erhebliches Manko, da viele Schüler in lichtschwachen Umgebungen arbeiten. Auch die Notwendigkeit, einen Schraubenzieher zur Hand zu haben, um die Batterie zu wechseln, könnte im privaten Bereich hinderlich sein.FazitInsgesamt ist das DLI-Messgerät eine nützliche Ergänzung für den Schulunterricht, insbesondere für Projekte im Freien. Dennoch müssen die Fachlehrer die Einschränkungen in der Innenanwendung und die umständliche Handhabung bei der Batterieerneuerung in Betracht ziehen. Für die Nutzung im Klassenzimmer ist es daher nur bedingt empfehlenswert, für den Schulgarten und Ökologieprojekte aber perfekt.
li
Reviewed in France on December 31, 2024
J'ai récemment acheté le AH-20Plus DLI Meter et je suis vraiment satisfait de cet appareil. En tant que passionné de jardinage, il est essentiel pour moi de connaître la quantité de lumière solaire que mes plantes reçoivent, et ce mètre de lumière est parfait pour cela. Il mesure précisément la lumière solaire en différentes conditions : plein soleil, soleil partiel, ombre partielle, et ombre totale.L'appareil est facile à utiliser, et les résultats sont instantanés. Il me permet de mieux comprendre les besoins en lumière de mes plantes et d’ajuster leur emplacement en conséquence pour favoriser leur croissance. De plus, il est très pratique avec des indicateurs clairs qui me permettent de surveiller les heures d'ensoleillement quotidien.C'est un outil indispensable pour les jardiniers sérieux ou même ceux qui débutent et veulent s'assurer que leurs plantes reçoivent la bonne quantité de lumière. Je le recommande vivement à tous les amateurs de jardinage !
PabloHorch
Reviewed in Spain on December 27, 2024
Este medidor de luz solar mide horas de sol pleno, sombra parcial y sombra total, siendo una herramienta indispensable para jardineros y agricultores. Su diseño compacto y fácil de usar proporciona datos precisos para ajustar la ubicación de las plantas o los cultivos. Ideal para maximizar el crecimiento y la salud de tus plantas. ¡Un accesorio imprescindible para amantes de la jardinería!
Tula Holic
Reviewed in the United States on December 26, 2024
After water, the most critical factor for growing plants is light. When trying to grow plants indoors under artificial lights, it is easy to wonder if they are receiving too little, or too much, light. Not enough light, and the plants fail to thrive, or even wither and die. Too much light, and we are wasting energy and possibly even damaging the plant.Ater having brought some plants indoors for the winter, I attempted to determine how much artificial light they needed. For humans, we can easily measure the amount of visible light in foot-candles or Lux. This is not a meaningful measure for plants, as they need light for photosynthesis.Light for photosynthetic plants is referred to as Photosynthetically Active Radiation (PAR) and is comprised of wavelengths between 400 and 700 nanometers. This is quantitatively measured as PPFD (Photosynthetic Photon Flux Density), typically in units of micromoles of photons per square meter per second (μmol/m²/s). One µmol/m2/s equals 6.022 X1016 (60,220,000,000,000,000) photons striking a one-square-meter area each second. If you are desire, you can purchase an expensive PAR meter that allows you to precisely measure the PAR at various distances and do all of the calculations yourself, but thankfully THERE IS A FAR, FAR EASIER WAY.The Daily Light Integral (DLI) is a single number that quantifies the light per area per day (in units of mol/m²/d, but you don’t even need to know that part). The AquaHorti AH-20Plus DLI Meter measures the DLI directly without the need for any other instruments or any math at all.Every plant has an optimum DLI that you can find by searching “plant DLI values”. A DLI meter will let you adjust your lighting to match. If you want to grow plants under artificial lights without complex, expensive equipment, or mind-numbing math, I recommend this meter.
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