Anyway to toggle a tile's light?

It appears that once a tile (with light properties) is loaded with the map , theres no way to remove the light when you “update” the tile to a different tile. the light remains. Also, is you upload a non-lit tile to a tile that has light properties, it doesn’t actually light up.  I tried the refresh() function but it didn’t do that.  Is there anyway to accomplish this. I am going to publish this game once it’s all ready and it’s going to be great - how can this be done?

Thanks Dyson!