All four of the Quanta Atlas lights are now hung with my 3D printed mounts.
These guys are bright! And hot!
Thankfully the heatsinks are heavy duty. They are very hot to the touch but the lights themselves are warm. Although I have a fan that exhausts to outside to help with both humidity and heat I think that with my small fish room and for the health and longevity of the lights I will install some fans to blow onto the heatsinks.
With the lights now installed I had some time to get some PAR readings. My PAR meter is the Vabira VBR-Aqua.
The lights are hung 3 feet above the top of the tank (measurements taken from the lights not the reflectors). My flow was only at about 10 percent from the right side of the picture and moving towards the left. The numbers with asterisks indicate measurements on the sand bed while the rest are from the rock scape. I am pleased to see how much punch these lights have with good PAR all the way to the sand bed. Reflections off the front of the acrylic are helpful here. Given how well the lights punch down I'm kind of surprised that the numbers aren't higher at the top of the tank.