You can dim it to half power for early veg and then crank it up later. I have an hlg 550 v2 rspec and this is what happened after a 20 day span. The root systems have been growing a while as I topped them for 4 and 8 mains, but I thought they grew real fast
1st pic is March 11
2nd pic is March 31
3rd pic is April 7th
The light has so far blown me away