Light Spore Blossom/Dripping Light Source

I've seen a lot of people complaining about the lighting system in Minecraft and how it doesn't really work in large buildings, and that got me thinking, what if there was an item added to fix this rather than reworking the whole system? Any light block that would sort of cascade light downwards and light up an entire vertical room rather than just a little spot on the ceiling would be awesome (inspired by the particles that drip from spore blossoms).