In my tropical region, my Dendrobium discolor can definitely handle a beating from quite intense sun conditions and hot days.
Dendrobiums like this sort handle that kind of condition a lot in the wild. Totally agree with what some people already mentioned about various sorts of Dendrobium.
They still need enough humidity, and suitable temperature growing range though.
This image was captured yesterday, showing a Den. discolor putting out a spike, with old spikes from previous flowerings still on the stem. Nearby are some Angcm. eburneum flowers. And the chilly plant just behind the dendrobium is a Carolina Reaper heheheheh. Very hot chilly heheh.