...or what layout is shown in the upper right? I can't quite decode the positions at which the glowstones are placed relative to the spawner.
I have a working xp grinder based around a blaze spawner in Nether. Now I want to build a wither skeleton grinder, but two most convenient crossings are located practically out the door of the blaze grinder chamber. And of course spawning blazes will completely overwhelm the skeleton spawns.
I saw a video with a smart way of toggling the spawner through placing four dispensers with lava buckets on the roof. The four lava streams, when flowing through the spawn area keep it lit enough that no blazes can spawn. But the video glossed over the dispenser locations too, not giving any angles good enough to determine just where they should be. It's almost certainly the layout in the upper right pic, but I really need to be sure - this being survival, I'd rather avoid punching unnecessary holes in a blaze spawner room ceiling.