Plant is getting worst leafs turning yellow brown

You need Epsom Salt mate .its mag/sulphur issue. Add 150ppm to tap Soil 6.4-6.8 ph Coco 5.5-5.8

You're only in veg right now, you are running the light at too high of intensity. Download the Photone app on your phone, it will help you set your light, aim for a ppfd reading of around 450-600. I would set the dimmer on the light to 25%-40%, you can lower it a little if you need to in order to get 450-600 ppfd. You will use the higher levels of intensity for your light during the middle of flower. Once you flip to flower, you can raise light intensity after a week or 2 and slowly raises intensity each week until the middle of flower, you will want around 800 ppfd in the middle of flower.