plantagogo.com is a great site for pics of heucheras. They have listed a heucherella named solar eclipse, and specify shade to part shade. However, soil and water conditions are going to make a big difference. You might try one and see how happy it is.
Jan

Solar Eclipse?...full sun?...there is a joke there that I'll stay away from.

I'd try one of your older ones there first. They'd be more adaptable given they have a better root system.

tj

I would like to say that the clever title was well thought out in advance but I would be not telling the truth. Thanks for making the connection though tsugajunkie.

In any event I took the chance and planted two SE not long after my original post; so they have been in the ground for almost 2 months. Come next season they will experience about 5 hours of afternoon sun per day.

Would love to hear a report on how solar eclipse heucherellas do in full sun....

I am also interested in knowing how they respond color-wise to more shade or less shade. I like them best when their centers look like dark chocolate, rather than a rusty nail. When I purchased mine from Lowe's, some had the very dark centers, and some had rusty centers. Just in case it made a difference, I chose all dark ones. However, I suspect the difference was just the amount of light they'd been exposed to over the previous weeks.