That's still 12W to get rid of from a small enclosed space. I wouldn't want to operate this at peak power all the time. And SMPS don't usually have peak efficie

That's still 12W to get rid of from a small enclosed space. I wouldn't want to operate this at peak power all the time. And SMPS don't usually have peak efficiency at rated output power. Do these things re-negotiate power contract, or will they just go into thermal shutdown when overheated?