My Hedychiums are in partial shade all summer, and a little more sun at this time of year. They grow fine but don't bloom in too much shade, but I haven't had problems with burning leaves on the ones that get morning sun. Even the variegated ones like Dr. Moy keep nice leaves in more sun, although they need a lot more water. I wonder if the sun's intensity is less in the summer months because of all the moisture in the air?
They're still blooming here, although as I said above, summer weather has held on way too long this fall. Our first night with a low temp below 60 will happen this coming week. Usually it happens in October.
The Shampoo Gingers are in dappled shade under my oak trees, and as long as they get a ton of water they bloom like crazy.