So I just got off of the phone with Grow Perfect. There isn't a finned heatsink because there is no heatsink. They run a Metal Core Printed Circuit Board that is the newest technology in heat dissipation.
Honestly, if you ask me, from REAL grow journals of people pulling a dry 1lb harvest in a 3x3 space, go with the mag+.
https://www.thcfarmer.com/community/threads/2nd-grow-magnum-357-og-kush.39289/
Read his grow. Now on this grow he is using 2 Magnums, not the plus, which only draw 180w each, equaling 360w, just 3 shy of of the Mag+. This is without the updated technology of the Mag+ as well.
I don't have any ties with Mag, I have just done a ton and ton of research and Mag's are def the way to go.
Mag has a medical grow under 180 of their lights and they yield about 130lbs...... Seriously, what other lights can boast that?