yes its a lot of lux blazin on the youngesters. think about a weker light for the first 21-25 dys... iam using a 2x25 watt led "pipe" for the little ones, very close around 10 cm . or iam using 100 watt in 35-40 cm, but best effects i get with the 2x25 watt. 3500 lux are enough for vegetation and the double amount for flowering
I hope you made plans for topping and LST because your growspace is very low, so the plantbetter stay small.
Do you care to let me know the brand of your lights? i cant believe the 11000 lux....sounds very much to a regular light normally they have 3500