Squidlin

@Megumin, You will not regret purchasing that light, it's fantastic. And thank you for the kind words! The reason for not going full power is heat mainly. I grow in a small space (60x60x140 tent) in a warm house and at full power I was seeing temps go up to 30c+ in the day. At 100w I see temps of around 25-26c. When I got the light I looked up guides and advise, generally it seems most people tend to run at 80%-90% power. They also use the light to regulate heat (hotter = turn up the wattage and move the light away. Cooler = turn the wattage down and move the light closer). For me personally it's all about balancing internal temperatures and exhaust fan noise, so I choose to run the fan slower to reduce noise which in turn increases the temperatures. I just set the light to whatever wattage fits within that. I stand to be corrected though, so do not take my word for it! On my current grow I am running the light at a higher wattage and plan to go about 90% max (about 120w).

@Skardy, Thank you! I don't tend to top autos as I don't want to stress them out. Obviously there's lots of anecdotal evidence for and against topping autos, but it makes the most sense to me to not as you can't provide the plant with additional veg time to recover the damage. I may be wrong though! I have a couple Sweet Tooth Auto seeds, maybe I should put it to the test.