Tropicals & Tender Perennials: Help with begonias ID please, 1 by truongr

truongr wrote:
Hi I got many of these begonias unlabelled at local garden centers. I 've been trying to ID them using Dave's files, the ABS pages and other website. I could use some of your expect opinion in confirming the ID of the following begonias.
#1 I believe this one is Cowardly Lion. It had a beautiful spray of white flower earlier in May and is very vigorous growing. Then I read a description of Northern LIghts which also seems to turn darker color when sun exposed. So which one is it?