Dim Bulb
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Dim Bulb is a trinket added in The Binding of Isaac: Afterbirth †.
Effects
- Increases all stats while Isaac's active item is completely uncharged:
- +0.50 speed.
- +1.50 range.
+1.00 tear falling speed- +0.40 tears.
+0.50 tears.- +0.30 shot speed.
- +1.5 damage.
- +2 luck.
Notes
- Dim Bulb is more than twice as powerful as
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.
- Items that charge automatically will get only a tiny moment of benefit from the Dim Bulb before they gain more charge again.
- Items with no charge bar like
How to Jump will activate Dim Bulb's effects permanently as long as the item is held. - Dim Bulb has no effect when no active item is held.
- If Isaac has 2 items (via
Schoolbag), only 1 of them needs to be empty to receive the benefits.
- This appears to have been patched out on PC. However, if one of your two active items has no charge bar (e.g.
Remote Detonator), you can swap to it after using the charged item to preserve the Bulb's effect.
- This appears to have been patched out on PC.
Synergies
4.5 Volt: Dim Bulb will be active for as long as the active item has less than one bar of charge.-
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 can be active simultaneously with Dim Bulb.
- If the active item is fully charged only with soul/blood charges and no regular charges,
Old Capacitor: As long as the active item uses charges, Dim Bulb can be held active indefinitely.
Interactions
9 Volt: Renders Dim Bulb useless, save for 1 charge items.- Dim Bulb produces no effect with active items in consumable slots, such as
Tainted Apollyon's 
Abyss, Tainted Bethany's 
Lemegeton or 
Tainted Magdalene's 
Yum Heart.
In-game Footage
 Active Item Modifiers
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| Items |
| Trinkets |
| Cards |
 Broken Items
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| Items |
| Trinkets |
| Cards and Runes |
 The Binding of Isaac: Rebirth
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