--- title: "921 bulb — Niche Verdict: Skip it (43/100) | Amazon United States - Flapen" canonical_url: "https://flapen.com/amazon/research/us/automotive/921-bulb" last_updated: "2026-07-09T23:56:14.631Z" locale: en meta: description: "a small market ($147K/yr) — 921 bulb doesn't clear our bar today." "og:description": "a small market ($147K/yr) — 921 bulb doesn't clear our bar today." "og:title": "921 bulb — Niche Verdict: Skip it (43/100) | Amazon United States - Flapen" --- Back to Flapen home # **921 bulb** **Skip it****43/100 ** a small market ($147K/yr) — 921 bulb doesn't clear our bar today. **Market/yr** **$147K** **Growth (1y)** **+159.8%** **Products** **25** **Brands** **16** was 13 a year ago **Sellers** **56** **Price range** **$3.67–$25.07** **Returns** **3.1%** **Rating** **4.6★** **Skip it** Scored 43/100 across market size, growth, competition, quality gap, and returns. Market sizeGrowthCompetitionQuality gapReturns Market size **7** ×0.30 Growth **72** ×0.30 Competition **45** ×0.20 Quality gap **32** ×0.10 Returns **75** ×0.10 ## **Demand** Weekly Amazon search volume, last 104 weeks — +159.8% year over year. 3K2KSpike '26Jul '24Nov '24Mar '25Jul '25Nov '25Mar '26 ## **Seasonality** Monthly demand index across the year — 1.00 is average. JFMAMJJASOND No pronounced peak months · busiest ÷ quietest = 1.4× ## **Competition** - SYLVANIA50% - Kadiby12% - QYKAVM10% - AUXITO7% - ALKOREY3% - SEALIGHT2% - Other (10 brands)15% The top 5 products take 60% of clicks — established leaders, but buyers still shop beyond them. 16 brands and 56 sellers compete here. **Brands** **16 **▲rising was 13 a year ago **Sellers** **56** **Top 5 brand share** **83%** #ProductBrandPriceRatingReviewsClick shareTrend 1 ![SYLVANIA - 921 SilverStar Mini Bulb - Brighter and Whiter Light Ideal for Center High Mount Stop Light (CHMSL) and More (Contains 2 Bulbs)](https://m.media-amazon.com/images/I/413gxOai97L.jpg) [**SYLVANIA - 921 SilverStar Mini Bulb - Brighter and Whiter Light Ideal for Center High Mount Stop Light (CHMSL) and More (Contains 2 Bulbs)**](https://www.amazon.com/dp/B0049A1N3U) SYLVANIA$11.674.6★91418%▲rising 2 ![SYLVANIA 921 Basic Miniature Bulb (Contains 2 Bulbs) (921.BP2)](https://m.media-amazon.com/images/I/512wQ3uKi+L.jpg) [**SYLVANIA 921 Basic Miniature Bulb (Contains 2 Bulbs) (921.BP2)**](https://www.amazon.com/dp/B000J2NZHO) SYLVANIA$5.784.6★1,01917%▼falling 3 ![QYKAVM 921 Bulb 12-Pack 921 912 RV Light Bulbs for Reverse Light Brake Light Tail Light Signal Light 12V W16W Camper Light Bulbs Compatible with Automotive RV Camper - 921 Bulb Reverse Light](https://m.media-amazon.com/images/I/41ARJp2-XBL.jpg) [**QYKAVM 921 Bulb 12-Pack 921 912 RV Light Bulbs for Reverse Light Brake Light Tail Light Signal Light 12V W16W Camper Light Bulbs Compatible with Automotive RV Camper - 921 Bulb Reverse Light**](https://www.amazon.com/dp/B0FTW46P24) QYKAVM$8.514.7★8510%▲rising 4 ![Kadiby 12 Bulk Pack 921 Bulb Camper Rv 921ll 921cv 912ll T15 912 904 906 916 W16W Backup//Stop/Trunk Cargo/Signal Auto RV Camper Light Bulbs Fit for Accord Silverado Ram Pickup Cherokee](https://m.media-amazon.com/images/I/41mmemvKMUL.jpg) [**Kadiby 12 Bulk Pack 921 Bulb Camper Rv 921ll 921cv 912ll T15 912 904 906 916 W16W Backup//Stop/Trunk Cargo/Signal Auto RV Camper Light Bulbs Fit for Accord Silverado Ram Pickup Cherokee**](https://www.amazon.com/dp/B0DG28VMQ7) Kadiby$9.404.6★2269%▼falling 5 ![SYLVANIA - 921 Long Life Miniature - Bulb Ideal for Interior Lighting - Cargo and License Plate (Contains 2 Bulbs)](https://m.media-amazon.com/images/I/41rWiE5PZjL.jpg) [**SYLVANIA - 921 Long Life Miniature - Bulb Ideal for Interior Lighting - Cargo and License Plate (Contains 2 Bulbs)**](https://www.amazon.com/dp/B000BLNTQU) SYLVANIA$6.624.5★1,3706%▼falling 6 ![Sylvania - 921 Long Life - High Performance Incandescent Bulb 35965 (10 Pack)](https://m.media-amazon.com/images/I/41iIXjshpcL.jpg) [**Sylvania - 921 Long Life - High Performance Incandescent Bulb 35965 (10 Pack)**](https://www.amazon.com/dp/B0031HI0MO) SYLVANIA$14.194.7★4524%—flat 7 ![SYLVANIA 921 Basic Miniature Bulb (Contains 10 Bulbs) (921.TP)](https://m.media-amazon.com/images/I/31Quc6FgV9L.jpg) [**SYLVANIA 921 Basic Miniature Bulb (Contains 10 Bulbs) (921.TP)**](https://www.amazon.com/dp/B000J2JEJW) SYLVANIA$9.294.7★3,0634%▼falling 8 ![AUXITO 912 921 LED Bulb for Backup Light Reverse Lights High Power 2835 15-SMD Chipsets Error Free T15 906 922 W16W Bulbs 6000K White Exterior Light Bulbs (Upgraded Pack of 2)](https://m.media-amazon.com/images/I/51QBttNULaL.jpg) [**AUXITO 912 921 LED Bulb for Backup Light Reverse Lights High Power 2835 15-SMD Chipsets Error Free T15 906 922 W16W Bulbs 6000K White Exterior Light Bulbs (Upgraded Pack of 2)**](https://www.amazon.com/dp/B0728DYR9H) AUXITO$12.734.5★35,9334%▼falling 9 ![ALKOREY W16W T15 912 921 12V 16W Back-up Reverse Lights Car Turn Signal Bulbs 2700K Warm White Automobile Lamps 2 Pack](https://m.media-amazon.com/images/I/417BSevkMxL.jpg) [**ALKOREY W16W T15 912 921 12V 16W Back-up Reverse Lights Car Turn Signal Bulbs 2700K Warm White Automobile Lamps 2 Pack**](https://www.amazon.com/dp/B0FH1628JX) ALKOREY$6.724.3★393%▲rising 10 ![Kadiby 20 pack 921 Bulb Back Up/Trunk Cargo/Turn Signal Auto RV Camper Stop Light Bulbs T5 12v 16w 904 906 912 916 Fit for Accord Silverado Ram Pickup Jeep Cherokee](https://m.media-amazon.com/images/I/41bIVaCn3KL.jpg) [**Kadiby 20 pack 921 Bulb Back Up/Trunk Cargo/Turn Signal Auto RV Camper Stop Light Bulbs T5 12v 16w 904 906 912 916 Fit for Accord Silverado Ram Pickup Jeep Cherokee**](https://www.amazon.com/dp/B0F47PG5R6) Kadiby$13.124.5★493%▲rising 11 ![UNLRAE 10PCS 921 Bulb Car Accessories T15 12V Ultra-Bright Camper Light Bulbs Automotive Replacement 921 Miniature Bulb RV Light Bulbs Cars Interior Accessories Suitable for Cars Trucks SUVs RVs](https://m.media-amazon.com/images/I/41mM6Cnxy5L.jpg) [**UNLRAE 10PCS 921 Bulb Car Accessories T15 12V Ultra-Bright Camper Light Bulbs Automotive Replacement 921 Miniature Bulb RV Light Bulbs Cars Interior Accessories Suitable for Cars Trucks SUVs RVs**](https://www.amazon.com/dp/B0FNCYR9YQ) UNLRAE$7.464.8★82%▲rising 12 ![VCYOPN 12 PCS 921 Bulbs 12V/16W T15 Bright Light Bulb Replacement for Reverse Backup Brake Tail Signal Lights 906 912 W16W Miniature Bulbs Compatible with Cars RVs Campers (Clear)](https://m.media-amazon.com/images/I/41P3H9Yo+EL.jpg) [**VCYOPN 12 PCS 921 Bulbs 12V/16W T15 Bright Light Bulb Replacement for Reverse Backup Brake Tail Signal Lights 906 912 W16W Miniature Bulbs Compatible with Cars RVs Campers (Clear)**](https://www.amazon.com/dp/B0GTQ89544) VCYOPN$6.894.7★42%▲rising 13 ![Hella 921TB Bulb 921 12V 16W W2.1X9.5D T5 (2)](https://m.media-amazon.com/images/I/413bPKYyrpL.jpg) [**Hella 921TB Bulb 921 12V 16W W2.1X9.5D T5 (2)**](https://www.amazon.com/dp/B079SH5J5X) Hella$3.674.6★4222%▼falling 14 ![Cannonfish 921 LED Bulb Reverse Light 921 912 906 W16W T15 LED Bulbs Non-Polarity Upgraded and 6000K High Bright (Pack of 2)](https://m.media-amazon.com/images/I/4105a+swvbL.jpg) [**Cannonfish 921 LED Bulb Reverse Light 921 912 906 W16W T15 LED Bulbs Non-Polarity Upgraded and 6000K High Bright (Pack of 2)**](https://www.amazon.com/dp/B0BYVV8D8C) Cannonfish$5.484.2★912%▲rising 15 ![AUXITO 912 921 LED Bulbs for Backup Reverse Light Bulbs 42-SMD 6000K Ultra Bright White Non-polarity 906 W16W T15 921 LED Bulb Direct Back Up Light Replacement Lamp Pack of 2](https://m.media-amazon.com/images/I/51ehcv+-BRL.jpg) [**AUXITO 912 921 LED Bulbs for Backup Reverse Light Bulbs 42-SMD 6000K Ultra Bright White Non-polarity 906 W16W T15 921 LED Bulb Direct Back Up Light Replacement Lamp Pack of 2**](https://www.amazon.com/dp/B08KFS93PS) AUXITO$15.754.5★20,3302%▼falling **~~Showing 15 of 25 — show all ~~** ## **Product shelf** All 25 tracked products in this niche. Top sellersNewestTrending [![SYLVANIA - 921 SilverStar Mini Bulb - Brighter and Whiter Light Ideal for Center High Mount Stop Light (CHMSL) and More (Contains 2 Bulbs)](https://m.media-amazon.com/images/I/413gxOai97L.jpg)**SYLVANIA - 921 SilverStar Mini Bulb - Brighter and Whiter Light Ideal for Center High Mount Stop Light (CHMSL) and More (Contains 2 Bulbs)** SYLVANIA**$11.67**4.6★914 reviews](https://www.amazon.com/dp/B0049A1N3U) [![SYLVANIA 921 Basic Miniature Bulb (Contains 2 Bulbs) (921.BP2)](https://m.media-amazon.com/images/I/512wQ3uKi+L.jpg)**SYLVANIA 921 Basic Miniature Bulb (Contains 2 Bulbs) (921.BP2)** SYLVANIA**$5.78**4.6★1,019 reviews](https://www.amazon.com/dp/B000J2NZHO) [![QYKAVM 921 Bulb 12-Pack 921 912 RV Light Bulbs for Reverse Light Brake Light Tail Light Signal Light 12V W16W Camper Light Bulbs Compatible with Automotive RV Camper - 921 Bulb Reverse Light](https://m.media-amazon.com/images/I/41ARJp2-XBL.jpg)**QYKAVM 921 Bulb 12-Pack 921 912 RV Light Bulbs for Reverse Light Brake Light Tail Light Signal Light 12V W16W Camper Light Bulbs Compatible with Automotive RV Camper - 921 Bulb Reverse Light** QYKAVM**$8.51**4.7★85 reviews](https://www.amazon.com/dp/B0FTW46P24) [![Kadiby 12 Bulk Pack 921 Bulb Camper Rv 921ll 921cv 912ll T15 912 904 906 916 W16W Backup//Stop/Trunk Cargo/Signal Auto RV Camper Light Bulbs Fit for Accord Silverado Ram Pickup Cherokee](https://m.media-amazon.com/images/I/41mmemvKMUL.jpg)**Kadiby 12 Bulk Pack 921 Bulb Camper Rv 921ll 921cv 912ll T15 912 904 906 916 W16W Backup//Stop/Trunk Cargo/Signal Auto RV Camper Light Bulbs Fit for Accord Silverado Ram Pickup Cherokee** Kadiby**$9.40**4.6★226 reviews](https://www.amazon.com/dp/B0DG28VMQ7) [![SYLVANIA - 921 Long Life Miniature - Bulb Ideal for Interior Lighting - Cargo and License Plate (Contains 2 Bulbs)](https://m.media-amazon.com/images/I/41rWiE5PZjL.jpg)**SYLVANIA - 921 Long Life Miniature - Bulb Ideal for Interior Lighting - Cargo and License Plate (Contains 2 Bulbs)** SYLVANIA**$6.62**4.5★1,370 reviews](https://www.amazon.com/dp/B000BLNTQU) [![Sylvania - 921 Long Life - High Performance Incandescent Bulb 35965 (10 Pack)](https://m.media-amazon.com/images/I/41iIXjshpcL.jpg)**Sylvania - 921 Long Life - High Performance Incandescent Bulb 35965 (10 Pack)** SYLVANIA**$14.19**4.7★452 reviews](https://www.amazon.com/dp/B0031HI0MO) [![SYLVANIA 921 Basic Miniature Bulb (Contains 10 Bulbs) (921.TP)](https://m.media-amazon.com/images/I/31Quc6FgV9L.jpg)**SYLVANIA 921 Basic Miniature Bulb (Contains 10 Bulbs) (921.TP)** SYLVANIA**$9.29**4.7★3,063 reviews](https://www.amazon.com/dp/B000J2JEJW) [![AUXITO 912 921 LED Bulb for Backup Light Reverse Lights High Power 2835 15-SMD Chipsets Error Free T15 906 922 W16W Bulbs 6000K White Exterior Light Bulbs (Upgraded Pack of 2)](https://m.media-amazon.com/images/I/51QBttNULaL.jpg)**AUXITO 912 921 LED Bulb for Backup Light Reverse Lights High Power 2835 15-SMD Chipsets Error Free T15 906 922 W16W Bulbs 6000K White Exterior Light Bulbs (Upgraded Pack of 2)** AUXITO**$12.73**4.5★35,933 reviews](https://www.amazon.com/dp/B0728DYR9H) ## **Reviews** What buyers praise and complain about, mined from review topics. ### **What buyers love ** **Brightness/Shine/Glow**48% *“Definitely bright”* **Size-Overall**11% *“Direct Fit”* **Quality-Overall**11% *“The quality of these bulbs is top notch”* **Value For Money**6% *“Cheap price”* **Assembly/Installation**5% *“Easy install”* **Advertised Vs Actual Product**5% *“Exactly as Advertised”* **Efficiency**3% *“energy efficient”* **Durability**1% *“durable”* **Ease Of Use**1% *“Easy Peasy”* **Functionality-Overall**1% *“functionality”* ### **What buyers complain about ** **Durability**27% *“not long lasting”* **Compatibility-Overall**11% *“Did not fit my truck”* **Quality-Overall**8% *“Inconsistent quality”* **Functionality-Overall**8% *“did get a non working one in the set”* **Size-Overall**7% *“return did not fit”* **Brightness/Shine/Glow**6% *“way too dim”* **Thickness**2% *“Too thick to fit 921 housing”* **Assembly/Installation**2% *“Took less than two minutes to remove the assembly”* **Value For Money**2% *“It's cheaper in the long run”* **Heating**1% *“Must be some issues with the circuits or low heat resistance”* #### **Top return reasons**- Size-Overall56% - Compatibility-Overall16% - Functionality-Overall6% - Brightness/Shine/Glow5% - Advertised Vs Actual Product5% - Defective Material/Parts4% - Assembly/Installation2% - Value For Money2% - Socket/Port/Plug2% - Color1%