That's just background. He said to me that he didn't think that lightsaber power cells were cannon (I guess he thought lightsabers had an infinate supply of power). I listed three sources: starwars.com, the Star Wars Technical Journal (I know, great source =P), and the Star Wars Roleplaying Game books (also another great source =P), but two of them are really bad sources, and one of them he has not believed as a good source in the past (he didn't believe that there were ducks in Star Wars even when I told him that they were listed at starwars.com

I was curious, what is the highest level of cannon that comments on the power source of a lightsaber? Also, about how many blast doors do you think one could go through before it at least began to run out of energy?