These LEDs are in a cars dash lights. I intend to swap them out with a different color to better match the rest of the dash. The dimensions are 1.5 mm x 3 mm. LED1 and LED5 both have a dome on top and LED2 has a cube. I’ve searched and I’ve been unable to identify what kind they are. Any help is appreciated. Thank you.

 

By "what kind" do you mean brand and model? I doubt if you can find that info without documentation from the car mfg.

They are surface mount if that helps, and probably illumination type.

I would gather as much info as I could by measuring the forward voltage of each then using the associated resistor and applied voltage to make a good guess about the current.

MCD and viewing angle are also important. (probably going to have to guess these)

Then go to a good supplier site like Digi-Key and use the filters to try and match up a replacement.

Keep in mind that you may have to also replace each one's resistor as well. (to get a proper brightness match)

If you are not willing to do some mixing, matching and experimentation I would give up the idea.

EDIT: After looking at the resistor values (if I got them right) I would say they are indicator type, not illumination type.

 

If your measurements are reasonably accurate, the LEDs are probably in a 1206 smt package.

If the package is "water clear" and you can clearly see the LED die in the package, they are non-diffused LEDs. This type of LED puts out a narrow beam of lights that will leave spots in your eyes. Instead, the LEDs most likely are "diffused", with the plastic of the package not being crystal clear. This type of LED will produce a larger angle of light, and the LED will appear illuminated from a wide angle when powered.

So on a site like Digikey, under LED, start with the parameters SMT, package = 1206, diffused and color = blue in the parameter table and drill down from there.

 

digikey-1
red

SML-LXL1206SYC-TR yellow
SML-LXL1206SOC-TR orange
SML-LXL1206USBC-TR blue

 

EDIT: After looking at the resistor values (if I got them right) I would say they are indicator type, not illumination type.

Indeed, they are indicator lights. It’s the “Passenger Airbag Off” indicator light.



I also realized that it wouldn’t matter changing out LED2 since it has a color filter on the button. I appreciate all the help in this thread. Thank you.

 

Replacing a yellow with a blue will mot work well because blue requires a much higher voltage (3.3 vs 2.0)

You might be able to do it if you also replace the resistor as well.

I disagree that you should use a diffused LED, they are clear foe a reason. They most likely project a narrow beam on a diffusing lens. A dffused LED will look very dim if that is the case.

 

Replacing a yellow with a blue will mot work well because blue requires a much higher voltage (3.3 vs 2.0)

You might be able to do it if you also replace the resistor as well.

I disagree that you should use a diffused LED, they are clear foe a reason. They most likely project a narrow beam on a diffusing lens. A dffused LED will look very dim if that is the case.

Honestly, I plan on making all the LEDs red because it’s easier on the eyes at night, and dare I say it looks more sporty. All of the LEDs are either green or amber right now. Personally, I think the green really dates the interior.

I’m not worried about a diffusing lens on the LED itself as all of the housings that the LEDs are in have diffusers where the light shines through so in this application, it isn’t necessary.

I’ll have to pull out the ol’ multimeter and pull some measurements off of the board and figure out if I need to replace the resistors as well. I haven’t done any “Ohm’s Law mathematics” in a while so it’ll be a good refresher.

 

Replacing yellow or green with red should not be a problem..