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PAR and PAR meter query

Hello....Your light setup looks nearly identical to my 45p setup. I took the measurements using the following:
Legs at maximum extension are = 22.5cm to the rim of the tank
Par meter = 1cm below the water line
Total distance = 23.5cm

At the highest setting (7), Par reading were : 190 middle / 132 back / 136 front / 109 left / 117 right
At setting 6, Par readings were: 170 middle / 119 back / 109 front / 92 left / 96 right

The substrate reading were done in the middle of the tank where I had the most room to work with: setting 7 = 100, setting 6 = 85.

I’m not surprised your stems are growing quickly, mine are as well. It appears that setting 4/5 does a good job of growing plants not algae. At setting 6 for 2 days, various types of algae showed up…
 
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