890 ppfd and 18 hours of light = 57.67 for your DLI not mid twenties. If I was you I would look up recommended dli for autoflowering cannabis . Look up ppfd for autoflowering cannabis. Also there are a lot more variables than just the light amount. RH% , Temp, Feed amount. I will tell ya when I got into the high 700's ppfd My plants did not like it. In my experience light burn did not happen in one day so keep an eye on them. You said you were not feeding full strength either. Hulk made a very valuable statement about upping feed when upping your light intensity. I am not at your grow with you but just keep an eagle eye on them at that high of ppfd. The way I adjust light is I bring up the dimmer raise the light up to where I am getting a close too the ppfd I had before and then SLOWLY bring the light height down to increase ppfd slowly. IMO and from what I have read autos do not take well to high ppfd. This is what I have learned so far. I am still learning so this to is subject to change Mistakes are not bad it is a valuable lesson