Probably this issue is related with #234 and #299. Even in last (3.3.8) version of Carpenter's Blocks mobs still spawn in areas lit by carpenter's torches. Torches burn visually, but do not stop mobs from spawning. I have tested it in minecraft 1.7.10 with only Carpenter's Blocks mod enabled (not counting Forge), as you can see on screenshot (left - normal torches, center - carpenter's, right - nothing). So, looks like cached lighting issue or whatever causing this is not solved yet.

I suggest using separate blocks for lit and unlit torches, like in other mods. It won't fix glowstone-lit blocks, but at least torches will work as expected.

It's just that I'm playing on server where carpenter's torches are cheapest source of light and there are lots of dangerous custom mobs. And it's disappointing that these torches are unusable.

Please give this build a try:
https://www.amazon.com/clouddrive/share/oSLKpx4uFq9PnuvPwHqWhK5tMF4NIrDEUofirsSr62M?ref_=cd_ph_share_link_copy

Wow, that was fast. With this build no mobs spawn near torches in test world, so looks like you fixed the issue. Thanks! For now everything seems ok.