Sub-Zero Classic Series (BI) Light Bulbs


  • Where to purchase replacement light bulbs for Classic series (BI) units
  • Replace or change BI light bulbs
  • How long should light bulbs last?
  • What size is the light bulb?
  • Can blue or LED light bulbs be used as a replacement bulb in older models?


To replace a light bulb:

  1. Remove the light diffuser to gain access to the light bulbs. See also, Classic Series (BI) Light Diffuser Removal and Installation.
  2. Remove the bulb by turning counterclockwise.
  3. Install the new bulb by turning clockwise.
  4. Install the light diffuser.

Classic series (BI) blue tint light bulbs and LED light bulbs can only be obtained by calling a Factory Certified Parts Distributor. They are not available for purchase online.

  • Verify the part number and quantity needed with the table below.
  • Starting with serial number 4380000, a long LED tube light is used in the crisper area. See also, Classic Series Crisper Drawer Lighting.
  • Prior to serial number 4380000, there is one bulb found in the crisper area of refrigeration units.
    • The crisper light bulb is the same as the overhead lighting.
    • Model BI-42UFD has two bulbs in the crisper area.
  • Other bulbs available in stores will fit our products, but the light color will not match.
    • Alternate bulbs need a T10, medium base, 40W appliance bulb.
    • Standard 40W appliance bulbs that fit these specifications tend to be yellowish.
    • Standard appliance bulbs are available in local hardware or home improvement stores.
  • Blue glass and LED light bulbs cannot be used in 500 or 600 Series units. Refer to a Parts Distributor for serial breaks on the 700 Series.

LED bulbs do not go out immediately when turned off. They slowly fade when the door switch is pressed. This is normal.

  • Longevity will vary based on how often the doors are opened and for how long per opening. Blue glass light bulbs have a life expectancy of 1000 hours.

See also, Substitute Incandescent Light Bulbs with LED.

Model# of Bulbs in Refrigerator# of Bulbs in FreezerPart Number
BI-30U31Prior to serial # 4380000: 7006999

Starting with serial # 4380000:
BI-42SD, BI-42SID33

    Refer to the product Use and Care Guide for further information.

    For information about other models, refer to Sub-Zero Light Bulbs.

    Genuine Sub-Zero, Wolf, and Cove parts are available by calling the Factory Certified Parts Distributor in your area. Only filters and cleaners are available for online purchase in the Sub-Zero, Wolf, and Cove Store. Other parts are not available for purchase online. Use Locator to find the Parts Distributor for your area.

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