Phantom
That's not the way to do it. If you give yourself over to Lex, that will hurt Chloe more. It's obvious she cares about you. Having you being experimented on would upset her, you know if would.
Plus, you in Lex's hands? You know he's going to try and find a way to make your power his. This will only lead to A) Lots of pain for you, B) A powerful weapon in the hands of Lex Luthor, who will only hurt people with it.
Giving yourself over to him isn't protecting anyone. It's suicide, and then probably suffering for others.