On break

[Gavin Hill]

how would I do it when I break the sea lantern the apples stop spawning.

on place of a sea lantern:
    set {_loc} to the location 1 meter above the block
    set block 1 meters above the block to glass
    loop 100 times:
        wait 5 seconds
        drop 10 apples at the event-location

 

[TPGamesNL]

You have to add a condition in the loop to check if the block at the location is still a sea lantern, if it's not, exit the loop

 

[Nutts]

I'll code what TPGamesNL said:

on place of a sea lantern:
    set {_loc} to the location 1 meter above the block
    set block 1 meters above the block to glass
    loop 100 times:
        block at event-block is not sea lantern:
            exit loop
        wait 5 seconds
        drop 10 apples at the event-location