Vivosun Areolight SE1000 , 100w with integrated fan

I've been running this 100w Led from Vivosun. . My first question being do I need to run a second fan when the light allready has an integrated fan built in , blowing down on the canopy.
My second question being .what intensity do you guys keep the lights at and what distance.
I'm on week three of veg . I have my lights intensity at 55%. And 19 inches from the canopy .I'm also only running the fan built into the light,. I'm wondering if this alone will provide enough airflow as it will save me space in my tent .

In a small space, you're probably fine with the fan that's in the LED unit, but, like chicken soup, another fan couldn't hurt. For distance and intensity refer to the manufacurers recommendations. Then try it it a little closer and a little higher intensity, if the plants show no ill effects, you're golden. I've found different plants react differently.