Oh yes there's not much change that seems to happen in terms of light intensity from our point of view but there sure is a change in watts being pulled from the wall
I'll raise the wattage In a week or so. I did have it to 500w but I seen stress right away on the girls for a week so I lowered the wattage back down and they come right.
Buy a wattage meter to plug the light into. That'll solve the problem... I don't have a accurate answer but the value of each click is maybe 50-75wat? I'm not sure. but I can say the dimmer is sensitive you can give it a ever so slightly turn and it will change by 5 to 10w.. and ill suggest...
Thought ill post up a grow using the HLG 600.
First time using LEDs
Loving the light. Still learning on dailing it in. Currently nearing the end of week 4. Running at 400w in a 5x5.
I wouldn't worry too much. A good led will bring the colors out of any plant. Also you don't really want to be running a led at 100% early into flower or at all