Hi @DansHampf, I do both, depending on temperatures outside. If we are in the summer time I'll lower the light and dim it and vice versa in winter. I use a Lux meter to test the light intensity, I never let it go over 75000 Lux unless I'm using Co2. Hope this helps and thank you for taking interest in my diary. Peace and happy growing. โ๏ธ๐๐ฟ