Um...sorry, gang, going to strongly disagree with those who'd rather pretend the snoring doesn't exist. Chances are there's sleep apnea going on...and that can lead to extremely major health issues. My husband developed nightmarish adult-onset grand mal seizures as a result of long untreated apnea. According to his doctors, healthy people do NOT routinely snore, especially not loudly.
So I vote for recording the snoring, and measuring the decibels on video, so when you play it back for them, you can be sure you have the volume set correctly for maximum impact.
/end rant
Back on topic: how much light is shed by a PW1/PW2 in the dark is very dependent on the light setting. I typically read at level 7 or so in full darkness, and at that level, it's less bright than most wall-mount night lights, and I should think that anything below 10 wouldn't bother most people. Whether or not this is a comfortable reading level or is something a bed partner can sleep through is going to be very subjective, though. There's definitely a small amount of light spillover even at those low levels, but it's certainly way less than a beside light or a flickering TV left on in the dark.