You brought this upon yourself botany (#21117)

code/__DEFINES/flags.dm

@@ -48,6 +48,7 @@
 #define STATIONLOVING_2			16
 #define INFORM_ADMINS_ON_RELOCATE_2	32
 #define BANG_PROTECT_2			64
+#define BLOCKS_LIGHT_2          128 // Light sources placed in anything with that flag will not emit light through them.
 
 // A mob with OMNITONGUE has no restriction in the ability to speak
 // languages that they know. So even if they wouldn't normally be able to

code/game/objects/items/weapons/storage/storage_base.dm

@@ -9,6 +9,7 @@
 	name = "storage"
 	icon = 'icons/obj/storage.dmi'
 	w_class = WEIGHT_CLASS_NORMAL
+	flags_2 = BLOCKS_LIGHT_2
 	/// No message on putting items in.
 	var/silent = FALSE
 	/// List of objects which this item can store (if set, it can't store anything else)

code/modules/lighting/lighting_source.dm

@@ -32,6 +32,9 @@
 /datum/light_source/New(atom/owner, atom/top)
 	source_atom = owner // Set our new owner.
 	LAZYADD(source_atom.light_sources, src)
+	if(top.flags_2 & BLOCKS_LIGHT_2) // If the top atom blocks light, then our owner becomes the topmost instead. This still allows atoms that block light to be a light of their own.
+		top_atom = source_atom
+	else
 		top_atom = top
 	if(top_atom != source_atom)
 		LAZYADD(top_atom.light_sources, src)
@@ -77,6 +80,9 @@
 		if(top_atom != source_atom && top_atom.light_sources) // Remove ourselves from the light sources of that top atom.
 			LAZYREMOVE(top_atom.light_sources, src)
 
+		if(new_top_atom.flags_2 & BLOCKS_LIGHT_2)
+			top_atom = source_atom
+		else
 			top_atom = new_top_atom
 
 		if(top_atom != source_atom)