After watching the movie and reading some movie reviews, I will summarize my thoughts on this "open way ending".
At the beginning of the film, in the conversation between Lena and her husband, it is mentioned that the death of a person is actually a kind of "error" of cells; this "error" leads to death; when the doctor of psychology talks to Lena, he learns from psychology again. The academic point of view explains this "wrong", that people tend to leave the "right" path, it also implies an extramarital affair between Lena and a colleague, and also explains why the husband voluntarily participates in this task. Humans are born with this "error" just like the cells that make us up
From the perspective of biological evolution, there is indeed a saying that light can change the evolution of species. And in the flickering, this strange light refracts the DNA of plants and animals and replicates. But when it comes to flashing people, everyone's ending is different. When the man in the isolation suit asked Lena why everyone else died and only she survived? She said that because she really wanted to come out, she didn't know if other people wanted it or not. In fact, everyone here is also affected by radiation, and is developing more or less in the direction they envision. That is to say, the role of the will in the face of this "self-destructiveness" of people. The will may be a rational thing, or it may be a deeper emotion, such as love for a husband. Of these people, while each carries his own "mistakes", perhaps Lena is the only one with such a will.
So, if at the end, suppose that through a drop of blood, a physical person is copied from a substance, and the physical person starts by copying Lena's actions, and gradually reproduces her will, it is also possible. It's worth noting that when Lena put the Phosphorus bomb on the replica's hand, she didn't exactly copy her movements, but rather copied her heart -- going through a death like my husband and destroying this beacon . This is also why the replica does not run away after receiving the phosphor bomb but stays in place. Perhaps, after the physical person has the same appearance as Lena, Lena has confirmed that it is another self - just like knowing what she will do next. Perhaps this also reflects the situation of her husband Kane at that time - living with a clone with the same thinking as himself, and finally he couldn't stand it and chose to commit suicide, and the clone returned to Lena with his will. And Lina's choice is the opposite, she keeps the part of her will to herself, and the part of destruction burns up with the lighthouse. So I think the end point is that Lena did survive, but part of her was destroyed with the lighthouse. His husband is probably a clone, but also a part of his husband. As for the flashes in the eyes, I don't think it's some alien mark, but something that keeps them all alive -- whether it's keeping itself alive, or a clone -- you can call it the will, or something.
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