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Light Part: BULB 12V 21019 21091 - Bubbles Supply

Light Part: BULB 12V 21019 21091

Part #: 21091

$4.64
In stock — ships today
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Also replaces

21019
1-year warrantySame-day ship before 3pm CTPerfect Fit Guarantee30-day returns

About this lighting

This is a 12V replacement bulb designed for Balboa spa lighting systems. This OEM-quality bulb (part numbers 21019/21091) provides reliable illumination for your spa's underwater lighting, ensuring safe evening use and creating the perfect ambiance for relaxation.

At Bubbles Supply, we guarantee this bulb delivers an exact fit for your Balboa lighting assembly. Our OEM-grade replacement parts ship same-day when ordered before cutoff, backed by our comprehensive 1-year warranty for complete peace of mind. Whether you're replacing a burnt-out bulb or upgrading your spa's lighting system, this 12V bulb meets original equipment specifications for optimal performance and longevity. Always verify your existing bulb's voltage and part number before installation to ensure proper compatibility with your spa's electrical system.

Exact part number

21091

Save this for ordering or warranty claims

Also known as / Replaces

This part replaces or is interchangeable with:

  • 12V spa light bulb
  • 21019
  • Balboa spa bulb
  • hot tub light bulb 12V
  • underwater spa bulb

Looking for an older part number? Check our supersession lookup tool

Technical specifications

Voltage
12V

Common symptoms this part fixes

If your spa is showing any of these signs, this part is likely your fix:

  • Spa light is completely dark
  • Bulb flickers on and off
  • Dim or yellowed light output
  • Burnt smell coming from light lens assembly
  • Light works intermittently then fails

Not sure if this is your problem? Try our diagnostic centre or .

Before you buy — quick checklist

  • Confirm your existing bulb reads 12V — do not assume; some Balboa systems use different voltages
  • Verify part number stamped on your old bulb or light assembly matches 21019 or 21091
  • Inspect the lens gasket and housing before reinstalling — a failed gasket is often what caused the bulb to fail
  • Check that the transformer or power supply feeding the light is functioning before replacing the bulb
  • If the new bulb fails quickly after install, suspect a voltage spike or faulty transformer

Reading the checklist now prevents 90% of returns. Worth the 60 seconds.

Install difficulty: Easy — DIY-friendlyTypically 10-20 minutes

Warranty

1 year warranty against defects

Covers manufacturing defects. Does not cover improper installation, normal wear, or accidental damage.

Warranty claims: warranty@bubblessupply.com

Perfect Fit Guarantee

Ordered with our help and the part doesn't fit? Contact us before installation. We'll resolve it with an exchange, replacement recommendation, or return approval.

Learn about our Perfect Fit Guarantee →

Shipping

We ship across the US and Canada. US orders ship from our US warehouse to US customers; Canadian orders ship from our Canadian warehouse to Canadian customers — no cross-border shipping, no surprise duties. In-stock orders placed before 3pm CT ship same day. Standard shipping $9.95 flat rate. Free shipping on orders over $200. Express options available at checkout.

Returns

30-day hassle-free returns on unused parts in original packaging. Contact us before returning to receive your RMA number.

Frequently asked questions

Check the Compatibility section above to confirm fitment for your spa brand and model. If your model is not listed, use our fitment selector at /pages/find-my-part or ask our parts AI for a personalized recommendation.

In-stock orders placed before 3pm CT ship the same day. You will receive tracking information by email as soon as your order ships.

We accept returns within 30 days of delivery for unused items in original packaging. Email returns@bubblessupply.com with your order number to start a return. Installed electrical parts cannot be returned for safety reasons.

Yes, all new parts come with a 1-year warranty against manufacturing defects. Warranty does not cover damage from improper installation or normal wear and tear.

Customer reviews

AI Fitment Assistant

Tell us your spa model and we will confirm this part fits before you buy.

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