As of today's patch in 1.11.0, hostile mobs can spawn in any open area regardless of lighting during a thunderstorm. My main base compound is thoroughly lit and has been totally secure for months, up till now. I have just witnessed a wide variety of hostile mobs (including a witch, multiple zombies and a creeper) spawning inside it under the conditions described. One spawned on a flat roof within the base building itself, so that is no longer secure either. I doubt if I'll be playing Minecraft again until this is fixed.
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I certainly hope that this is not an intentional effect. It looks as if it may be applying a negative offset to ALL outdoor light sources for the purposes of mob spawning. To be more specific about the situation I saw: the compound is totally surrounded by a wall with an exterior overhang at the top, and all entrances are gated and only one block wide, so not even spiders can get in. The entire open space is covered with a grid of torches spaced at 4 blocks centre-to-centre - the standard lighting scheme I’ve been using for years, inside and out.
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The base building itself uses the same security measures (overhanging balcony all around, single-width entrances below the overhang) and has an enormous expanse of flat roof, with the appropriate torch grid. Since this luckily didn’t spawn a host of mobs, I assume that they were inhibited by the material (glass and stone brick blocks). The one mob (a zombie villager) which did spawn behind me while I was watching, aghast, may have spawned on a catwalk (also properly lit, of course) spanning a single-storey area, which uses stone brick steps and stone slabs.
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This bug screws up one of the fundamental and best (in my opinion) mechanics of the game - that monsters spawn in the dark, but you can reliably prevent this by using lights.
[Mojang] Mega_Spud (Jay)
Cleaning up old tickets: This ticket has not been updated recently (~1 year+) so is being closed as Cannot Reproduce. If you feel this is still a valid issue then please comment, or create a new ticket following the Issue Guidelines.
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It might be intended. Unlike during regular rainstorms or snowstorms, the light level from the sky is treated as if it were 5 for the purposes of hostile mob spawning, which allows hostile mobs to spawn at any time of the day.