Pushing sunlight (short of sunburn)

[qbie]

Pardon my silly question. I have only grown phals so am new to growing sarcochilus, dendrobium, coelogyne, cymbidium (and possibly an epidendrum). I understand they all require more light than phals. Would it be safe to say, even tho exposed to some direct sun, as long as the leaves feel cool to warm to touch the plants will likely not be sunburnt? So factors like ambient temperature, breeze and light intensity can affect how much sunlight the plant can tolerate? Thank you!