Tachi mei translation help

[JeanEB]

Hi everyone, 

I've come across a listing for an unpapered tachi from a consignment sale (yes, I know that's just asking for trouble). The pictures on the listing aren't that clear, nor is the contrast obvious, but I'm trying to figure out what this signature could be. I can make out the 光 but not the kanji just superior to it.  I would appreciate any help, thanks in advance!

[Nobody]

It could be 盛光 - Morimitsu. (?)

 

[JeanEB]

def could be, I tried to play with the contrast to make it clearer in this one

[SteveM]

Or 長光 (Nagamitsu)