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 be used anytime, like 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 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. Remote Detonator Remote Detonator), you can swap to it after using the charged item to preserve the Bulb's effect.


  • Added in Repentance4.5 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 RepentanceEraser Eraser / 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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