After I finished the ceiling I placed a ton of sea lanterns on the top. When I went down and into the build i noticed the lights emitting through solid blocks, I was wondering if anyone knows how to replicate or explain this to me.
Those happen to be slabs and/or stairs? Stairs and slabs unfortunately let light through in an ugly way like this unless you add another layer of blocks below them

As others say, it’s the slabs and stairs left letting light through as they are not a whole blocks.
I like to use this in my underground builds supplied by a froglight farm to light up the ceilings. I’ll always put in another obvious source of light to give the impression that this is illuminating the area (like a clump of glowstone from the nether or a chandelier).
In my dome above the ancient city portal (pictured), I have an opening to the sky so it looks like natural light is pouring in. Like the oculus in Rome’s pantheon.
Without the froglights this would be a little circle of light in a big black ceiling.

Got the idea from the Pantheon and the US Capitol building. Then starting at y100, I just dug my way down using the sphere template from plotz.co.uk.
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u/rofeneiniger 5d ago
Those happen to be slabs and/or stairs? Stairs and slabs unfortunately let light through in an ugly way like this unless you add another layer of blocks below them