---
title: "921 Bulb — $147K/yr Amazon US Niche (2026) - Flapen"
canonical_url: "https://flapen.com/research/us/automotive/921-bulb"
last_updated: "2026-08-09T12:29:21.009Z"
locale: en
meta:
description: "Niche score 43/100 · $147K/yr market · 107K searches/yr · $10.82 avg price. Doesn't clear our bar today. Data updated Jul 2026."
"og:description": "Niche score 43/100 · $147K/yr market · 107K searches/yr · $10.82 avg price. Doesn't clear our bar today. Data updated Jul 2026."
"og:title": "921 Bulb — $147K/yr Amazon US Niche (2026) - Flapen"
---
# **921 bulb**
**Skip it**
A deep review moat (4,840 avg reviews) — this niche doesn't clear our bar today.
Market size 32Growth 39Conversion 95Competition 41Returns 48Price range 47Avg price 40Brand share 37Review moat 25Quality gap 28
**Conversion**
**Incredible****12.8%**
search→purchase rate — share of searches ending in a sale
**Returns**
**Okay****3.1%**
return rate — above 5% kills the launch gate
**Price range**
**Okay****$3.67–$25.07**
cheapest to priciest tracked listing — scored on the share inside $15–$100
**Competition**
**Okay****60%**
top-5 click share — leaders hold, buyers still browse
**Avg price**
**Okay****$10.82**
avg listing price — sweet spot $15–$100
**Growth**
**Okay****+11.2%**
90-day search growth — must beat 0% to launch
**Brand share**
**Okay****83%**
top-5 brand share — brands hold most of the demand
**Market size**
**Okay****$147K**
$147K/yr · 107K searches
**Quality gap**
**Okay****4.6★**
avg incumbent rating — lower means beatable quality
**Review moat**
**Bad****4,840.24**
avg incumbent reviews — the moat a new listing must climb
According to Flapen's Amazon United States niche tracking, 921 bulb is a $147K/yr Amazon United States market (107K searches/yr). The top 5 brands hold 83% of demand. Verdict: Skip it — 43/100.
Data updated Jul 9, 2026 · scored weekly · [~~How we score niches ~~](https://flapen.com/research/methodology)
## **921 bulb market data**
- **Units sold / yr**
- **13K–15K**
- avg 1,000–1,250/product
- **Revenue / yr**
- **$135K–$162K**
- units × avg price
- **Conversion rate**
- **12.8%**
- **Avg BSR**
- **#50**
- **Page quality**
- **0%**
- **Prime**
- **100%**
- **Sponsored**
- **88%**
- **Out of stock**
- **1.7%**
- **Avg brand age**
- **50 months**
- **Avg seller age**
- **181 days**
## **Competition & brand share**
The top 5 products take 60% of clicks — established leaders, but buyers still shop beyond them.
**Brands**
**16 **▲rising
**Sellers**
**56**
**Top-5 brand share**
**83%**
Top 20: 100%
**Top-5 click share**
**60%**
Top 20: 95%
**Open market**
**15%**
- SYLVANIA50% - Kadiby12% - QYKAVM10% - AUXITO7% - ALKOREY3% - SEALIGHT2% - Open — no brand owns it (10 brands, 15%)
## **Demand & seasonality**
Weekly Amazon search volume, last 104 weeks — +11.2% search growth over the last 90 days.
3K2KSpike '26 seasonSepDecMarJunAugNovMarMay
No pronounced peak months · busiest ÷ quietest = 1.4×
[**Open Trend **](https://flapen.com/research/us/automotive/921-bulb/trend)
## **Top 921 bulb search terms**
- **921 bulb**67K/yr+12.7%10.4% conv. - **921 brake light bulb**7K/yr+14.4%8.8% conv. - **921 light bulb**7K/yr+22.7%10.6% conv. - **sylvania 921 bulb**8K/yr+1.7%15.6% conv. - **sylvania 921**6K/yr+13.0%13.9% conv. - **921 bulbs**6K/yr-6.8%8.9% conv. - **bulb 921**3K/yr+3.1%11.2% conv. - **921ll bulb**3K/yr+3.6%11.9% conv. [**All search terms **](https://flapen.com/research/us/automotive/921-bulb/search-terms)
## **Top 921 bulb products on Amazon**
Each bubble is one product — market share against review moat; bubble size tracks estimated sales, color grades how beatable the incumbent looks.
0%5%$7K10%$15K15%$22K20%$29K1101001K10K100K Reviews — right = deep review moatMarket share (90d) ≈ est. sales
Beatable (≤4.3★) Contested Strong incumbent (>4.7★)
All 24 tracked products in this niche — three views at once, no toggling.
### **Top sellers**
by 90-day click share
[1**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 rev](https://www.amazon.com/dp/B0049A1N3U) [2**SYLVANIA 921 Basic Miniature Bulb (Contains 2 Bulbs) (921.BP2)**SYLVANIA**$5.78**4.6★1,019 rev](https://www.amazon.com/dp/B000J2NZHO) [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**QYKAVM**$8.51**4.7★85 rev](https://www.amazon.com/dp/B0FTW46P24) [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**Kadiby**$9.40**4.6★226 rev](https://www.amazon.com/dp/B0DG28VMQ7) [5**SYLVANIA - 921 Long Life Miniature - Bulb Ideal for Interior Lighting - Cargo and License Plate (Contains 2 Bulbs)**SYLVANIA**$6.62**4.5★1,370 rev](https://www.amazon.com/dp/B000BLNTQU)
**~~View all top sellers →~~**
### **Newest**
by launch date
[**GIVEDOUA 921 T15 Bulbs 912 906 916 W16W Automotive Backup/High Mount Brake/Trunk Cargo/Interior Dome/Turn Signal Replacement Bulbs Fit for Most Sedans SUVs Pickup Trucks RVs and Campers(10 Pack)**GIVEDOUA**$7.23**2 rev1mo ago](https://www.amazon.com/dp/B0H1TW5PKX) [**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)**VCYOPN**$6.89**4 rev3mo ago](https://www.amazon.com/dp/B0GTQ89544) [**AUXITO 921 LED Bulb Reverse Light 400% Bright 912 T15 6000K White Canbus Error Free W16W 906 904 Backup Replacement Parking Light Assemblies For Car/Trunk Pack of 2**AUXITO**$11.68**11,013 rev7mo ago](https://www.amazon.com/dp/B0FZTLBX4N) [**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**85 rev9mo ago](https://www.amazon.com/dp/B0FTW46P24) [**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**UNLRAE**$7.46**8 rev10mo ago](https://www.amazon.com/dp/B0FNCYR9YQ)
**~~View all new products →~~**
### **Trending**
90-day click momentum
[**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)**VCYOPN**$6.89**4.7★**▲ 276%**](https://www.amazon.com/dp/B0GTQ89544) [**GIVEDOUA 921 T15 Bulbs 912 906 916 W16W Automotive Backup/High Mount Brake/Trunk Cargo/Interior Dome/Turn Signal Replacement Bulbs Fit for Most Sedans SUVs Pickup Trucks RVs and Campers(10 Pack)**GIVEDOUA**$7.23**5.0★**▲ 274%**](https://www.amazon.com/dp/B0H1TW5PKX) [**AUXITO 921 LED Bulb Reverse Light 400% Bright 912 T15 6000K White Canbus Error Free W16W 906 904 Backup Replacement Parking Light Assemblies For Car/Trunk Pack of 2**AUXITO**$11.68**4.6★**▲ 121%**](https://www.amazon.com/dp/B0FZTLBX4N) [**ALKOREY W16W T15 912 921 12V 16W Back-up Reverse Lights Car Turn Signal Bulbs 2700K Warm White Automobile Lamps 2 Pack**ALKOREY**$6.72**4.3★**▲ 110%**](https://www.amazon.com/dp/B0FH1628JX) [**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★**▲ 99%**](https://www.amazon.com/dp/B0FTW46P24)
**~~View all trending →~~**
## **What buyers say about 921 bulb**
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-Overall**56%
**Compatibility-Overall**16%
**Functionality-Overall**6%
**Brightness/Shine/Glow**5%
**Advertised Vs Actual Product**5%
**Defective Material/Parts**4%
**Assembly/Installation**2%
**Value For Money**2%
**Socket/Port/Plug**2%
**Color**1%
## **Common questions**
- **Is 921 bulb profitable to sell on Amazon United States?**
- The niche generates $147K/yr across 25 tracked products. 1 of 5 products launched in the last 360 days are still selling. 90-day search growth is +11.2%. Flapen's verdict: Skip it (43/100).
- **How competitive is the 921 bulb niche?**
- 16 brands and 56 sellers compete. The top 5 products take 60% of clicks and top 5 brands hold 83% of demand.
- **What do buyers complain about in 921 bulb?**
- Top complaints mined from reviews: Durability, Compatibility-Overall, Quality-Overall. The return rate is 3.1%.
- **When does demand for 921 bulb peak?**
- Demand is steady year-round — the busiest month runs 1.4× the quietest.
- **What does it cost to enter the 921 bulb niche?**
- Listings span $3.67–$25.07; the average listing price is $10.82 (sweet spot $15–$100). The average incumbent carries 4,840 reviews — the moat a new listing must climb.
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