Light Burn?

This is one of two white widow autos, week 9.5. They were on 20/4 but I have switched to 18/6 since seeing this. Using a SF-1000. My Photone app was reading the correct PPFD but I’m starting to wonder now.
 

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I hope not but my concern is with the brown and yellow spots and discoloration on some upper leaves and very few lower/middle leaves
 
Dont think you'll be burning much with 100w spider farmer. Those free phone apps are not real reliable either. Even with a 'paper filter'.
 
Definitely looks like light burn.

Is it at 100%? If so, scale back to about 70% and let the plants adjust to the light before increasing the intensity.
 
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