Stackable Regular, Colored, and Tinted Lightbulbs

Lightbulbs can easily be made from glass bottles with some iron (maybe?), or be crafted by the usual 3 glass crafting recipe for glass bottles, but with added iron in the middle so Colored and Tinted Lightbulbs can also be crafted.

When powered by a power source the Lightbulb will turn on and will emit light depending on the value of the power source. I imagine the Lightbulb could also be placed up to 9 times on a block surface for a sort of polka dot effect (if modeled to be less wide to not touch each other the space will be more apparent instead of a bright colored blend across the block). It could also connect to an already placed Lightbulb, and just like powered redstone, will emit less light depending on the length away from the built upon powered Lightbulb. 27 Lightbulbs will be able to fit into a single block of space with this logic and will be easy to fit 15 Lightbulbs into a single column for 1 to 15 values for light.

Even if not powered the various glass on a build would still look very nice.