LED Turn Signal FAQ


Which LED color is good for turn signal lights?

Please note: “√” means legal color.
Application Xenon White Amber Yellow Brilliant Red Ultra Blue
Front Turn Signal Off Road Off Road
Rear Turn Signal Off Road Off Road
Backup Reverse Off Road Off Road
Brake/Tail Lights √ for red lens Off Road Off Road

What’s a T20 bulb?

A T20 bulb is commonly known by industry standards as the following bulb sizes: 7440 7441 7443 7444 992A, etc. These T20 bulbs are commonly used for the turn signals, tail/stop lights, reverse lights, and daytime running lights.; T20 bulb stands for 20mm width on the top of the bulb. Back to Top

automotive light bulbs T20


What is a T25 bulb?

A T25 bulb is commonly known by industry standards as the following bulb sizes: 3156 3056 3157 3057 3357 3457 4157, etc. These T25 bulbs are commonly used for the turn signals, tail/stop lights, reverse lights, and daytime running lights.T25 bulb stands for 25mm width on the top of the bulb. Back to Top

 

automotive light bulbs 3156 3157


What is a BA15 bulb?

The term BA15 means Bayonet base with 15mm in diameter. A BA15 bulb is commonly known by industry standards as the following bulb size: 1156 7506 7527 1157 2057 2357 7528 P21W P21/4W, etc. These BA15 bulbs are commonly used for turn signal, tail/stop lights, reverse lights and daytime running lights.  Back to Top

automotive light bulbs S25 single filament


I bought the LED lights for the backup reverse lights and it is dimmer than my stock, is that ok?

It should be ok because the backup reverse lights are meant to alert others so they know there is a car is reversing rather than actually illuminating the road. Also if you are unhappy with the output of the bulbs you can contact us and we can recommend a brighter option for you. Back to Top


Why do my LED turn signal lights hyper flash?

When your LED turn signals flash rapidly, that is known as “hyper-flashing”. The rate that they blink is roughly twice than the normal flash rate. This is because when you replace the stock turn signals with LED bulbs; due to their low power draw, the regular rate of power being given to the lights is more than enough to light them up which speeds up the blinker process. Although this will not damage your vehicle nor the LED bulbs, some people may find it a distraction and may want to have it blink at the regular rate. To have the LED bulbs blink at a regular rate, you would need to purchase load resistorsBack to Top


>What’s a switchback LED bulb?

A switchback means it has two colors (White and Amber) which can switch back and forth. It is commonly used to replace the double-filament bulbs for the front turn signal lights which can function as both parking position lights and turn signal lights. So this way you can have the parking position lights in a HID matching xenon white color and the turn signal lights in a street legal amber yellow color.

To sum up in order to install the switchback LED bulbs, you will need to make sure your front turn signal lights function for both turn signal and parking lights and the lens needs to be clear.     Back to Top


What is SRCK socket?

Please take a look at these two diagrams below. The conventional socket has positive terminals on both sides but the SRCK socket has positive terminals on the same side. So a non-SRCK compatible LED bulbs installed to a SRCK socket will cause a short resulting fuse-pop or even damage the LED bulb.However, don’t worry because JDM ASTAR LED bulbs are mostly SRCK compatible. Please check the notes before purchase to confirm whether CK compatible or not.

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