Vanilla Light Bulb

Upgrade	Effect	Sell value	Magic Powder
+0	+6% XP · +6% Coins	10,680	160
+1	+6.2% XP · +6.2% Coins	11,310	163
+2	+6.4% XP · +6.4% Coins	12,108	168
+3	+6.6% XP · +6.6% Coins	13,074	174
+4	+6.8% XP · +6.8% Coins	14,208	186
+5	+7% XP · +7% Coins	15,510	199
+6	+7.2% XP · +7.2% Coins	16,980	212
+7	+7.4% XP · +7.4% Coins	18,501	273
+8	+7.7% XP · +7.7% Coins	20,178	340
+9	+8% XP · +8% Coins	22,011	414

Extracting this Treasure returns Magic Powder. The amount is fixed per Treasure and upgrade level — it does not depend on which ingredients were used to evolve it.

The bulb never burns out, so you'll never have to replace it. How great is that!