I don't own the Seamaster NTTD but can you outline what you mean when you say "the lume is not very bright?" The PURPOSE of Lume is to make a watch readable in low-light conditions, while also NOT having a negative impact on the viewer's night vision. The purpose of lume is ultimately not "to look fancy." It has a use case.
The lume should last through the night and be legible even hours after daylight light exposure to a degree that if you wake up in the middle of the night with your eyes adjusted to low light, it should be legible.
Question: have you allowed your eyes *three full minutes* to become accustomed to the dark room you are in, before looking at or judging whether or not the lume is "bright enough?"
EDIT to add: I will say that the NTTD has lume just on the point of the hands, and I can see this being a complaint IF you're used to a full lumed hand. The only Omega I own is a SM300MC, and it did take me a couple of days to adjust to the fact that only the arrowhead of the hour hand is lumed. Now that I'm used to it, it's totally fine though.
Also, congratulations on your new watch! I think the NTTD is quite attractive and like that they went with a sort of warm vintage brown.