Lots of brown spots and yellowing!? HELP!

[Eyezzz95]

Hello I am a beginner this is my first grow
please help!!! this lady was doing fine until I changed from and cheap light to the much stronger Mars T600 then this happened!! maybe I shouldn’t have changed so drastically but my other girls didn’t seem to mind. But this lady is not happy!!! Also she is a photoperiod and she is about two months old. Is this a nutrient problem, a light problem, both,or something else please help!! Thanks

• Mazar, Growers choice seeds,
• Method: Coco coir with perlite
• Vessels: Pot
• PH 5.5
• CALMAG, advanced nutritions trio, and humboldts secret gold trees PPM: 328
• Indoor
• Light: Mars Hydro t600
• Temps; Day: 79 F Night: N/A
• Humidity; 80 , Night N/A
• Ventilation system; Not yet
• Humidifier
• Co2; No

[Myfriendis410]

I would bump up the nutes: 300 ppm and plant is starving. You should be up around 900 ppm now. I would also bump up the cal mag.

[AfgVet]

Welcome to the forum @Eyezzz95, looks like MyFriend has you covered

[Eyezzz95]

Damn haha okay I’m really low then okay sweet thank appreciate it very much!!!