Yeah, My strips run hotter than most like to run theirs.
I didn’t end up getting the 480w when I was doing my build, i got a HLG-320h-24A and it tops out around 400w (good batch) or so.
At 300w:
I can tell you now that i’m running them at 385w they are significantly warmer. The strips with the least airflow in my setup are uncomfortable to touch for very long, but won’t outright burn you. The LM561C is a durable little diode, even running close to max operating temp, I see these still lasting longer than any other light i’ve ever used.
The two outside strips on each end in my setup would be the first to burn out, even If in two or three years I had to replace them, i’m out a max of 80$ over 3 years. No biggie to me.