Binding of Isaac: Rebirth Wiki
Binding of Isaac: Rebirth Wiki

Added in Afterbirth †

Dim Bulb is a trinket added in The Binding of Isaac: Afterbirth †.


  • Increases all stats while Isaac's active item is completely uncharged:
  • Items that charge automatically will get only a tiny moment of benefit from the Dim Bulb before they gain more charge again.
  • Removed in Repentance If Isaac's active item has no charge bar and can used anytime, like 15►How to Jump How to Jump, Dim Bulb's effects will be permanent.


  • Dim Bulb is more than twice as powerful as Vibrant Bulb Vibrant Bulb; however, its effects are active less frequently.
    • However, 1 room charge items can be used at the start of each room to effectively get the Dim Bulb's effects constantly.
  • Dim Bulb has no effect when no active item is held.
  • If the player has 2 items (via 15►Schoolbag Schoolbag), only 1 of them needs to be empty to receive the benefits.
    • This appears to have been patched out on PC. Removed in Repentance However, if one of your two active items has no charge bar (e.g. 15►Remote Detonator Remote Detonator), you can swap to it after using the charged item to preserve the Bulb's effect.


  • Added in Repentance15►4.5 Volt 4.5 Volt: Dim Bulb will be active for as long as the active item has less than one bar of charge.
  • Bethany Bethany / Tainted Bethany Tainted Bethany: The effect remains active with both soul and blood charges.
    • If the active item is fully charged only with soul/blood charges and no regular charges, Vibrant Bulb Vibrant Bulb can be active simultaneously with Dim Bulb.
  • Added in Repentance15►Eraser Eraser / 15►Notched Axe Notched Axe: These can be used/depleted as soon as possible to have Dim Bulb active for the rest of the floor.
  • Added in RepentanceOld Capacitor Old Capacitor: As long as the active item uses charges, Dim Bulb can be held active indefinitely.


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