The factory setting is about 90% of the full power. And it can be 110%. Staying 90% is beneficial to the lifespan of the light.
During seedling, the power also can be lowered down through dimmable function.
Yea I've left it at factory settings since I've had it, I could've lowered it for seedlings but just let them on the outside of the brightest part. Hopefully gonna run some legend strains under this SP 250.....Ive already got 2 ready to put in flowering!!!! Hopefully I can get everything ready ASAP, got about 15 more plants to get ready also/transplant for flowering. And I work alone, I'm pushing to get these plants in flowering quick as I can. So We'll have some nice plants to look at soon!!!!