Heat stress?

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1

Is this a sign I need to adjust my light distance?Im using 300watt led

20200827_102257
20200827_1022572448×3264 3.1 MB
20200827_102209
20200827_1022092448×3264 2.53 MB
20200827_102607
20200827_1026072448×3264 3.22 MB
20200827_102134
20200827_1021342448×3264 2.36 MB

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2

whats their current distance?

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3

It wasn’t heat stress,my light distance is 25inchs

4

Humidity or temp?

5

My day temp is 75-78 humidity is 60% night temp was off so I fixed that ,the humidity is 56