Not possible due to lighting engine limitations. The max amount the initial light source can have its 15 and it goes down by 1 per block of distance.
A lot of things that were supposedly impossible were cleverly coded in. For instance, you could have a luminator simulate multiple light source blocks. I could think of a couple ways that could be done, although it would be awkward and stupid. Perhaps someone could think of an elegant solution.
EDIT: Pseudo-air was exactly what I was thinking of.