Leaves drying need advice

Hello again
Just been happy with my grow, they are coming along. Everything looks good till today when I found some yellow brown and dry leaves. My lights are led 1200 and a 1000 . I am growing 4 plants about 2 weeks now.
I had the lights about 7" above plants can it be lights are to close or maybe a water issue. I don’t want to lose them now thank you

7 in is to close for two-week-old plants with that wattage of led lights without knowing what kind of Lights I would raise them up to about 23 in

Thanks