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921 bulb

Skip it43/100

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★

43/100

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.

No pronounced peak months · busiest ÷ quietest = 1.4×

Competition

50%SYLVANIA
  • 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)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★91418%rising
2
SYLVANIA 921 Basic Miniature Bulb (Contains 2 Bulbs) (921.BP2)SYLVANIA 921 Basic Miniature Bulb (Contains 2 Bulbs) (921.BP2)
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 LightQYKAVM 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★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 CherokeeKadiby 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★2269%falling
5
SYLVANIA - 921 Long Life Miniature - Bulb Ideal for Interior Lighting - Cargo and License Plate (Contains 2 Bulbs)SYLVANIA - 921 Long Life Miniature - Bulb Ideal for Interior Lighting - Cargo and License Plate (Contains 2 Bulbs)
SYLVANIA$6.624.5★1,3706%falling
6
Sylvania - 921 Long Life - High Performance Incandescent Bulb 35965 (10 Pack)Sylvania - 921 Long Life - High Performance Incandescent Bulb 35965 (10 Pack)
SYLVANIA$14.194.7★4524%flat
7
SYLVANIA 921 Basic Miniature Bulb (Contains 10 Bulbs) (921.TP)SYLVANIA 921 Basic Miniature Bulb (Contains 10 Bulbs) (921.TP)
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)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$12.734.5★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 PackALKOREY 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★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 CherokeeKadiby 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
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 RVsUNLRAE 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$7.464.8★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)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$6.894.7★42%rising
13
Hella 921TB Bulb 921 12V 16W W2.1X9.5D T5 (2)Hella 921TB Bulb 921 12V 16W W2.1X9.5D T5 (2)
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)Cannonfish 921 LED Bulb Reverse Light 921 912 906 W16W T15 LED Bulbs Non-Polarity Upgraded and 6000K High Bright (Pack of 2)
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 2AUXITO 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
AUXITO$15.754.5★20,3302%falling

Product shelf

All 25 tracked products in this niche.

SYLVANIA - 921 SilverStar Mini Bulb - Brighter and Whiter Light Ideal for Center High Mount Stop Light (CHMSL) and More (Contains 2 Bulbs)

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 reviews

SYLVANIA 921 Basic Miniature Bulb (Contains 2 Bulbs) (921.BP2)

SYLVANIA 921 Basic Miniature Bulb (Contains 2 Bulbs) (921.BP2)

SYLVANIA

$5.784.6★1,019 reviews

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 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 reviews

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 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 reviews

SYLVANIA - 921 Long Life Miniature - Bulb Ideal for Interior Lighting - Cargo and License Plate (Contains 2 Bulbs)

SYLVANIA - 921 Long Life Miniature - Bulb Ideal for Interior Lighting - Cargo and License Plate (Contains 2 Bulbs)

SYLVANIA

$6.624.5★1,370 reviews

Sylvania - 921 Long Life - High Performance Incandescent Bulb 35965 (10 Pack)

Sylvania - 921 Long Life - High Performance Incandescent Bulb 35965 (10 Pack)

SYLVANIA

$14.194.7★452 reviews

SYLVANIA 921 Basic Miniature Bulb (Contains 10 Bulbs) (921.TP)

SYLVANIA 921 Basic Miniature Bulb (Contains 10 Bulbs) (921.TP)

SYLVANIA

$9.294.7★3,063 reviews

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 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

$12.734.5★35,933 reviews

Reviews

What buyers praise and complain about, mined from review topics.

What buyers love

Brightness/Shine/Glow48%

“Definitely bright”

Size-Overall11%

“Direct Fit”

Quality-Overall11%

“The quality of these bulbs is top notch”

Value For Money6%

“Cheap price”

Assembly/Installation5%

“Easy install”

Advertised Vs Actual Product5%

“Exactly as Advertised”

Efficiency3%

“energy efficient”

Durability1%

“durable”

Ease Of Use1%

“Easy Peasy”

Functionality-Overall1%

“functionality”

What buyers complain about

Durability27%

“not long lasting”

Compatibility-Overall11%

“Did not fit my truck”

Quality-Overall8%

“Inconsistent quality”

Functionality-Overall8%

“did get a non working one in the set”

Size-Overall7%

“return did not fit”

Brightness/Shine/Glow6%

“way too dim”

Thickness2%

“Too thick to fit 921 housing”

Assembly/Installation2%

“Took less than two minutes to remove the assembly”

Value For Money2%

“It's cheaper in the long run”

Heating1%

“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%

Data scraped July 9, 2026 · Marketplace baseline: 4.4★ avg rating · $22.74 median price · 2.2% median returns across 13,649 tracked niches.