Nighttime Lamp
/summon MinecartCommandBlock ~ ~1 ~ {Command:kill @e[type=MinecartCommandBlock,r=1],Riding:{id:MinecartCommandBlock,Command:setblock ~ ~-1 ~1 redstone_block,Riding:{id:MinecartCommandBlock,Command:setblock ~ ~ ~1 command_block 0 replace {Command:fill ~ ~-3 ~-1 ~ ~ ~ air},Riding:{id:MinecartCommandBlock,Command:"/setblock ~1 ~ ~ daylight_detector_inverted",Time:1,Riding:{id:MinecartCommandBlock,Command:"/setblock ~1 ~-1 ~ redstone_lamp",Time:1,Riding:{id:MinecartCommandBlock,Command:"/fill ~1 ~-3 ~ ~1 ~-2 ~ fence",Time:1,Riding:{id:MinecartCommandBlock,Command:gamerule commandBlockOutput false,Riding:{id:MinecartCommandBlock,Riding:{id:FallingSand,Block:activator_rail,Time:1,Riding:{id:FallingSand,Block:redstone_block,Time:1,Riding:{id:FallingSand,Block:stone,Time:1}}}}}}}}}}}