Could also be Bright Hour, which looks very much like Helen but the bloom is a bit smaller. There is another almost identical to Bright Hour but I am blanking on its name at the moment.
"The chimera is a one time happenstance event where the plant has a senior moment and forgets what it is doing." - Paul Black
I think the three that are similar are Helen Collingwood, Bright Hour, and Wabash. My opionion: Yours seems to resemble Helen Collingwood most because it seems to have very pale purple standards rather than pure white.
Wabash always has a thin, bright edge of white on the falls, which Helen Collingwood definitely does not have. Bright Hour serms to have a hint of that, but it's not nearly as clear and distinct.
-"If I can’t drain a swamp, I’ll go pull some weeds." - Charles Williams
Helen's blooms are larger than Bright Hour's and Wabash so it is tricky to know for certain unless you get Helen from a good vendor and grow it side by side.
For the record my Bright Hour also has faint purple in the standards. Depends on the winter weather and your soil.
"The chimera is a one time happenstance event where the plant has a senior moment and forgets what it is doing." - Paul Black
Last night I noticed the bloom closed and it was opened up fully again this morning. These are the first iris I have owned. I was unaware it had this characteristic of closing at night. Thanks to everyone's input on the id