Is there any way to create light but there is no source block anywhere? So like, you can see the light but there isn't a source block that is creating that light.
Unless you know how to make light glitch stay, there is no vanilla method to do that.
There are 2 most common choices:
1. Ask players to install Optifine. Its dynamic lighting can make entities luminous.
2. Hide the light source. As long as the block is transparent, light can pass through it. (some great examples are light under carpet, light behind pistons and barrier + NoGravity:1 falling blocks + light source under it)
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1. New minigame for Christmas! (Yes it's over, I know...) Check it out!
2. If you found my command solutions helpful, try to make my work worthwhile by crediting me. However, if you are to credit me, let me do it by:
Joining the map server or giving me a download link to add stuff.
This is mainly because I don't want some simple signs mentioning my name or my stupid head sticking to the wall.