I just wanted to post some measurements of PAR taken at the substrate with a Seneye PAR meter.
I purchased a new Fluval 3.0 because I wanted to see what all the hype was about, and the stems in the rear of the tank weren't growing as well as I wanted them to. They had a habit of shedding their lower leaves. I knew the Finnex fixture's PAR output fell sharply at distance, as I had measured it before. After doing some reading, many sources indicate that shedding of the lower leaves was a sign of a lack of light - and thanks to posters like @Seattle_Aquarist
, it gave me the itch to try the Fluval light!
Well, it didn't disappoint - I actually suspect it may have to be dialed back a bit, but for now I'm going to leave it and see what happens.
The Finnex Planted Plus 24/7 CC light sits about 16.5 inches from the substrate and it gave me a reading of 40 PAR at the substrate.
The Fluval 3.0 sits about 14.5 inches from the substrate and it gave me a reading of 114 PAR! Nearly three times what the Finnex is capable of.
PUR was relatively equal - the Finnex @ 62% and the Fluval @ 60%.
Hopefully this helps with the ailment of shedding bottom leaves. The tank is on an EI dosing regimen with an 8 hour photoperiod. I frontload macros and dose micros 3x a week with a 50% water change performed religiously, adding NilocG's GH booster.
Anyways, thanks for looking. If there are any questions, comments, or criticism, please don't hesitate to post. The top screen shot is the Finnex Planted Plus 24/7 CC and the bottom is the Fluval 3.0 at 100%. All measurements are taken in water in an established planted tank.