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This is my 13th grow and I could never have more light or the tips would start to burn (more than 450 umols or 18000 lux). I use biotabs or greenhouse nutrients and my space is cramped (0.36 m2), ventilation is OK, heat is around 25 deg and I use blumats drippers and a scrog
Also give your plants 6 hours darkness, no matter how strong the ruderalis part in them is, a part of them is still a Cannabisplant that needs his 12 hours sleep. If you want big buds you need to let them rest. Also just because ruderalis and so autoflowers can take 24hours never implied that its any close to optimal. I dont know your lightcycles tho, just in case
Fck thats apps, if you put a screenprotector on it doesnt work at all. Also its reflecting certain angles and can only measure direct light from like a 60-140 degree(realistic in a tent is 0-180) intake.
The value is always lower, use the measurings of your product or from products with similar watts and specs ( same gen of LEDs etc). Every professional brand provides a PPFD map for their lamps.
Runtz F1 Automatic
Sensi Skunk Automatic
Russian Auto 
