Quantum PAR Meter Full-Spectrum High Precision PPFD Tester for Photosynthetic Activity of Indoor and Outdoor Plants 400-700nm Light Lux Tester

A PAR meter is useful to know if plants are receiving enough light of the kind that they need. Using this has been very useful for adjusting grow lights and understanding when a grow light is needed. I am completely reliant on the claims of accuracy since I don't own an apogee meter to test it against. Maybe someone does and can report the results. But I'm happy with it and do recommend it if you aren't sure that your plants are getting enough light, or you are not getting the results you want with the lights you have. Use the PAR reading along with DLI (daily light integral) to adjust your light intensity or distance to your plants and how many hours the light must run for the plants you are growing. Different plants need different total amounts of usable light. There are websites and videos that cover PAR and DLI which are a good resource.

I needed it more than I thought I did. Works great!!!

Exactly what I needed to measure the USABLE LIGHT for the plants.

works good, necessary tool to dail in your environment.

Very affordable PAR meter. It has really helped with my grow light area as well as my outside cacti and succulents. Easy to use!

I recently purchased the PAR meter, and I must say, it has been a fantastic addition to my gardening toolkit! As someone who is serious about growing plants indoors and optimizing their light conditions, this meter is a game-changer. I wouldn't say it is completely accurate, so unless you want to spend hundreds of dollars on a more advanced meter, definitely continue to monitor your plants; otherwise, this is a great choice for the price.

Still in experimental phase. Product seems to be working perfectly.

I don’t know how I got along without this thing. In my previous life, I was a professionally trained advertising photographer, and I used colorimeters, light meters, and flash meters on a daily basis to determine the correct exposure for the film. This functions as a light meter for the LED, and it gives you a value which you can use to obtain consistency.