Help Diagnosing

First time grower. Thought I’d help get things going here. Pretty sure I have some mute burn here but thought maybe other could chime in. Northern Lights Auto. Organic Soil. Water PH 6.5. Gave first dose of nutes 4 days ago at half dose. Figured it was time since the first leaves started to brown.

Other thoughts are it could be overwatering or maybe light is too close or bright. But neither seem right since I wait for soil to dry to water and following guide my light came with.

Any thoughts?? Thanks