Lucid reality

[izildop]

how real can a lucid dream become

[torakrubik]

Depends entirely on how you define 'real', something that you will question more and more as you progress in your journey.
Assuming you are comparing LDs to waking reality, they can appear to be VERY real. Indistinguishably so, with regards to visuals and sensory inputs in general.

[lucidinthe sky]

I think the better question is: How awake are you when you experience it? Dream reality and waking reality are pretty close to the same in terms of our sensory perception which is the only way we can judge "what is real?" Our brains take in the sensory data and "project" reality onto our internal screens. We are able to do this in dreams without any sensory data inputs, but if we simply sleep through them, we never really experience the level of "reality" that dreams have. This is why we want to have lucid dreams so that we can be awake when we are experiencing dream reality. Then we can make the evaluation of how real it is while it's happening, instead of trying to experience it from memory.