This is PIAA's LED bulb for automotive room lamps, LER121, with a T10 type socket.


About this product

This 100lm LED bulb for automotive room lamps delivers "approximately 2 to 2.4 times" the brightness of a typical factory-installed bulb. Furthermore, the low power consumption reduces the burden on the battery.


In addition, the "welcome blue function" is a unique feature. This function glows blue when the key is released and switches to white after about 5 seconds. This can create a fun action when getting into the car.


The built-in constant-current circuit allows for problem-free installation in high-voltage EVs and hybrids, as well as in vehicles with unstable voltage. It is also polarity-free, making it easy to install.


After the color change, the luminous color is a beautiful and transparent blue-white 10,000K, creating a luxurious atmosphere inside the car.


Of course, it is manufactured under the high quality standard of PIAA in Japan.


About PIAA

PIAA is an aftermarket automotive supply brand headquartered in Tokyo, Japan.

Its parent company is Ichikoh Industries, Ltd., which manufactures automotive lighting fixtures and supplies lighting fixtures to Toyota, Nissan, Honda, Suzuki, and other Japanese automakers on an OEM basis. Ichikoh Kogyo was founded in 1903 and has been in business for over 100 years.Ichikoh Industries, Ltd. is also a member of the Valeo Group, which provides innovative products and systems that contribute to the reduction of CO2 emissions and the development of intuitive driving to automakers worldwide.


PIAA also continues to evolve through its participation in motorsports. In the past, PIAA has sponsored Formula 1(F1), and currently supplies lamps for international races such as the World Rally Championship (WRC) for automobiles, the DAKAR RALLY, and the FIM Endurance World Championship for motorcycles. In Japan, we also supply lamps for SUPER FORMULA and SUPER GT, the pinnacle races, and have earned the trust of many teams for their high performance and reliability.


LED bulb line-up for PIAA's room lamps



Bulb Type

Welcome Blue Series

High Kelvin Series

High Color Rendering Ra97 Series

T10

LER121 10000K

LER122 6600K

LER125 10000K

LER126 6600K

LER105 6600K

LER106 6000K

T10×31

T8×29

LER123 10000K

LER124 6600K

LER127 10000K

LER128 6600K

LER107 6600K

LER108 6000K


Other PIAA LED Bulbs

Headlights/Fog lights Here

Front Position lights Here

Turn Signal Lamps Here

Backup lamps Here


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Shipping Method

We will ship via eBay SpeedPAK - Ship via FedEx or eBay SpeedPAK - Ship via DHL within 3 business days after payment is received.


We will upload your tracking number to eBay as soon as possible after shipment.


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Payment Methods

We accept PayPal, Google Pay, VISA, Master Card, and Amex. 


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Return Policy

We accept returns for 30 days.


If you wish to return an item, please contact us first at.


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About Customs Duties

Import duties, taxes and fees are not included in the item price or shipping charges. These charges are the buyer's responsibility.


Please check with your country's customs office to determine what these additional costs will be prior to purchase.