PAR Meter up to 6000umol/(㎡s) DLI Calculator PPFD Recording

Used for par reading at surface of aquarium. Put in a plastic bag it works under water too.

Making a PPFD Map Using the FH-100 PAR Meter for the Sunco 80 Watt Grow LightFirst a couple of definitionsPPFD=Photosynthetic Photon Flux Density. It is measured in micromoles per square meter per second and is a measurement of light intensity over a defined area at a specific distance per second.DLI=Daily Light Integral. It is measured in moles per square meter per day and is a measurement of how much light has shown on a defined area at a specific distance per day. (PPFD * #seconds of light provided per day divided by 1,000,000).Customer Service at Sunco could not provide a PPFD Map or any PPFD values for any distance on this grow light. Clearly they did not understand, and could only tell me to put the plants 12"-37" below the light. So I bought a meter that reads PPFD (the FH-100) and produced my own map at appropriate heights for the tomato seedlings I will be growing. Turns out the recommended height is way off of where it needs to be.This grow light will be fine for my tomato seedlings (which optimally take a minimum of 300 PPFD for a 13.0-17.3 DLI), but this light cannot provide enough PPFD intensity for mature tomato plants (takes around 700 for optimal fruiting). Tomato seedlings can take up to 700 PPFD without damage. For those of you looking to grow pot, it likes even higher (>1000 PPFD) for good yields. Having sufficient PPFD for an appropriate DLI is important for plant growth. Hanging the light 6.6 inches directly above my 3 seed starting trays should get me in the sweet spot for all 45 cells, except for the outer four on each end. I intend to experiment with foil covered cardboard sides to reflect light back onto the outside 8 cells. My source of information is here:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4235429/The 3 trays trays are centered directly underneath the light. PPFD measured by placing sensor directly on top of each cell in the trays. Measured width is 6" between centers of front and back cell. Measured length is 42" between centers of far left and far right cells.Some quick measurements (maps at 6.5" and 9.5" are in photos below):Center cell was 900 PPFD @ 1" below bulbCenter cell was 705 PPFD @ 2.5" below bulbCenter cell was 503 PPFD @ 4.5" below bulbCenter cell was 380 PPFD @ 6.5" below bulbCenter cell was 290 PPFD @ 9.5" below bulbCenter cell was 212 PPFD @ 13" below bulbSunlight in late afternoon on sunny Winter day in Indiana was 1400 PPFD. Seems reasonable to me - but accuracy is not verified against another meter. Readings in different cells at different light heights were quite repeatable. This meter seems a very good value.So much for 12"-37" distance for anything else than low-light plants like violets, for the Sunco 80W grow light. I need to place it at 6.5" to grow tomato seedlings.

ペアリングができず、出品者であるCOTANAK LTDさんに問い合わせても、詳細は分からないと言われてしまいました。出品者さんにもよるかも思いますが、きちんと機能するかどうかわかりません。

Have nothing to compare to but my phone and seems to be pretty good with values, my phone shows Less and doesn't give correct values (off the charts) at close distance to lights but the meter does seem to give good readings closer to the lights.

This works as advertised. Love the DLI info. Never knew if my lights were to close or far from the tops of the plants. With this knowledge I can adjust my lights as needed. Great for dialling in your grow. Great value.