As far as those nutes or additives, I’m not familiar with them at all so I won’t comment for fear of giving bad info.
I unfortunately don’t have any social media and we are NOT allowed to share personal information here so I wouldn’t be able to ship a light to you. But, if you’re not opposed to building your own light setup or happen to find an affordable light but don’t really know much about it, @dbrn32 is a light guru and a one of our great mods here. He’s advised me a few times with lighting and he won’t steer you wrong.
The calibrating setting did not exist when we used the photon app. The updated app does have the option to calibrate but the app itself does it automatically to whatever your factory setting are. Not sure if that’s specific to iPhone or android. I personally wouldn’t calibrate unless you think it’s off.
This is the DLI chart I use. 25-30 DLI is good for vegetative growth. I would however check the light at full power at like 15inches above canopy to see what you can get for a reading and set the app to a 12hr cycle to see if you’re able to hit the ideal DLI numbers for mid to late flower. Then be sure to set yank the way it was. lol.