921 bulb
Skip itA deep review moat (4,840 avg reviews) — this niche doesn't clear our bar today.
Conversion
Incredible12.8%search→purchase rate — share of searches ending in a sale
Returns
Okay3.1%return rate — above 5% kills the launch gate
Price range
Okay$3.67–$25.07cheapest to priciest tracked listing — scored on the share inside $15–$100
Competition
Okay60%top-5 click share — leaders hold, buyers still browse
Avg price
Okay$10.82avg listing price — sweet spot $15–$100
Growth
Okay+11.2%90-day search growth — must beat 0% to launch
Brand share
Okay83%top-5 brand share — brands hold most of the demand
Market size
Okay$147K$147K/yr · 107K searches
Quality gap
Okay4.6★avg incumbent rating — lower means beatable quality
Review moat
Bad4,840.24avg 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
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.No pronounced peak months · busiest ÷ quietest = 1.4×
Top 921 bulb search terms
- 921 bulb67K/yr
- 921 brake light bulb7K/yr
- 921 light bulb7K/yr
- sylvania 921 bulb8K/yr
- sylvania 9216K/yr
- 921 bulbs6K/yr
- bulb 9213K/yr
- 921ll bulb3K/yr
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.
All 24 tracked products in this niche — three views at once, no toggling.
Top sellers
by 90-day click share
SYLVANIA - 921 SilverStar Mini Bulb - Brighter and Whiter Light Ideal for Center High Mount Stop Light (CHMSL) and More (Contains 2 Bulbs)
SYLVANIA$11.674.6★914 rev
SYLVANIA 921 Basic Miniature Bulb (Contains 2 Bulbs) (921.BP2)
SYLVANIA$5.784.6★1,019 rev
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$8.514.7★85 rev
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$9.404.6★226 rev
SYLVANIA - 921 Long Life Miniature - Bulb Ideal for Interior Lighting - Cargo and License Plate (Contains 2 Bulbs)
SYLVANIA$6.624.5★1,370 rev
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$7.232 rev
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$6.894 rev
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$11.6811,013 rev
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$8.5185 rev
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$7.468 rev
Trending
90-day click momentumVCYOPN 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$6.894.7★
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$7.235.0★
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$11.684.6★
ALKOREY W16W T15 912 921 12V 16W Back-up Reverse Lights Car Turn Signal Bulbs 2700K Warm White Automobile Lamps 2 Pack
ALKOREY$6.724.3★
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$8.514.7★
What buyers say about 921 bulb
What buyers praise and complain about, mined from review topics.What buyers love
“Definitely bright”
“Direct Fit”
“The quality of these bulbs is top notch”
“Cheap price”
“Easy install”
“Exactly as Advertised”
“energy efficient”
“durable”
“Easy Peasy”
“functionality”
What buyers complain about
“not long lasting”
“Did not fit my truck”
“Inconsistent quality”
“did get a non working one in the set”
“return did not fit”
“way too dim”
“Too thick to fit 921 housing”
“Took less than two minutes to remove the assembly”
“It's cheaper in the long run”
“Must be some issues with the circuits or low heat resistance”
Top return reasons
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.