What I was most worried about doesn't seem to be an issue. Yesterday was 112* out and the LEDs had no issue. Heat doesn't seem to be a problem with the large heat sinks and fans these have now.
As long as the LED drivers are decent, you shouldn't have any real problems just because of ambient heat. Being in an enclosure does raise the temps on the LED die, and will shorten lifespan, but you should still get plenty of life out of them.