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18 votes

OEM LED tailights: white vs red LEDs under red plastic

My thoughts - A white LED can be used in multiple lamps in the same car, brakes, side, indicators, reverse lamps, so limiting the need for different stock. The assembly line will be simpler, so more ...
HandyHowie's user avatar
  • 25.4k
9 votes

OEM LED tailights: white vs red LEDs under red plastic

Quality tail lights use red LEDs for the red parts. White LEDs behind a color filter are very inefficient and typically used by cheap OEM parts (and fake OEM parts for that matter) which look good on ...
Dmitry Grigoryev's user avatar
5 votes
Accepted

How to fix 2007 Mercedes SLK daytime running lights?

After hours of tracing cables, removing panels and taking apart more of the car than I'd like to admit, I figured the issue out. Apparently there's a cable for control current (or something like that)....
Kallja's user avatar
  • 251
4 votes

Why is my LED turn signal "randomly" blinking too fast?

As far as I know, automotive-class "blinkers" work as self-timed "multi-vibrator", where the blink time is (somehow) determined by impedance of light bulb. It is very frequent to see on a car when one ...
Ale..chenski's user avatar
4 votes

How does color temperature influence headlight performance?

The color of light, expressed in degrees Kelvins (K). The sun is about 5800 K. This is called a "temperature," because the hotter a flame or a lamp filament gets, the more it changes from a warm ...
Old_Fossil's user avatar
  • 3,962
4 votes
Accepted

automotive LEDS specified as 6v-36V required 9 or 12v... why?

Yes, there is a deeper meaning behind the wide input voltage range detailed in the specifications you're working from. In general, all electrical components, especially integrated circuits, have some ...
WebsterXC's user avatar
4 votes

OEM LED tailights: white vs red LEDs under red plastic

Definitely red LEDs under a red (or white, for that matter) cover. This is how a (good) factory tail lights are made. Modern illuminating LEDs are more efficient when they are narrow-band color. E.g. ...
fraxinus's user avatar
  • 2,102
4 votes

OEM LED tailights: white vs red LEDs under red plastic

One part of the answer might be spectrum or gamut. There are govt specifications for the color of tail lights, SAE standards etc. It may be that it's easier to get the exact color needed in plastic ...
Jim Mack's user avatar
  • 169
3 votes
Accepted

underseat lighting that goes on when door opens or with switch

You'll need a double-throw switch, i.e. one that can switch one output to either of two inputs. I'd get one with an off position as well (often labelled on-off-on in shops). Before wiring it up, you'...
Nick C's user avatar
  • 28.8k
3 votes
Accepted

LED bar power directly from battery?

In general, if you can connect the LED bar directly to the cables to the lights, you can also wire it directly to the battery. But a car battery has enough power to easily melt a wrench touching both ...
sweber's user avatar
  • 7,057
3 votes

Why is my LED turn signal "randomly" blinking too fast?

Bulb resistance is your problem, but physics aside, you have a few options: 1) Purchase an LED specific blinker relay. Google will help. 2) Wire a resistor in parallel with your LED. 3) Purchase ...
justinm410's user avatar
  • 1,742
3 votes

Why do LEDs go out on (boat) trailer tail-lights?

More than likely, the leds in the light assembly are being over driven for reasonable light output. Typical 5mm and smaller leds, including the typical 5050 or 0805 SMD leds used in these assemblies ...
cde's user avatar
  • 603
3 votes

What diode for 12v automotive circuit...?

Assuming the LED pods are at most 12W that's 1A. For lots of margin you could use 1N540x (where X is 4, 5, or 6) 3A diodes, two for each of the rear lights. The front ones just get wired directly. ...
Spehro Pefhany's user avatar
2 votes

What diode for 12v automotive circuit...?

I would separate the supply to the rear lights from the front and use a relay - the two inputs being from either battery, the output to the lights, then there would be no issue of the batteries being ...
Solar Mike's user avatar
  • 34.6k
2 votes
Accepted

A very simple circuit to supress 12v pulses from illuminating some LEDs

Credit to @Andrew Morton for this answer; which he is happy for me to submit. I simply used PA Soft to disable the checks in the Light Control Module (LCM) by going into "module coding" (or similar?) ...
Toby Wilson's user avatar
2 votes

Planning to replace hid bulb to led H1 connector

LED bulbs will not give the light output (lumens) needed for good vision at night. The "ordinary" halogen bulbs you replaced are better than LED for lighting up the road at distance at the moment, ...
Solar Mike's user avatar
  • 34.6k
2 votes
Accepted

Which illuminate dark roads better? Halogen vs. LED Fog Light?

Headlights and fog lights have a parabolic reflector that is shaped to shine in a cone ahead of the car, the light source has to be in the right position to focus correctly. Think of a magnifying ...
GdD's user avatar
  • 17k
2 votes

LED bar power directly from battery?

If you want to power your LED bar on together with the high beams the correct way is to connect a relay to your high beams, and have it turn the LED bar on/off. The power can be taken directly from ...
Jakub's user avatar
  • 581
2 votes

New LED tail/brake lights not working on my Toyota RAV4

No, it doesn’t make sense. The only way to send too much current to a bulb would be by increasing the supplied voltage above its rated value. If a bulb is rated for 12 volts then it will only draw the ...
HandyHowie's user avatar
  • 25.4k
1 vote
Accepted

Warm white LED lamp recommendations?

It really doesn't matter what the package says for color temp because those numbers are usually wrong. Recent testing by the SAE showed that most LED mfgrs color and lumen numbers are way off---no ...
user9181's user avatar
  • 1,392
1 vote

Load resistor heat issue from front turn signal lights serving as parking lights at night

The power rating of a resistor is how much it can dissipate continuously, and being a "power resistor" that would be at a surface temperature of perhaps 150 °C. To find out how much power it is ...
Andrew Morton's user avatar
1 vote

Brake/position LED Lights

After searching around I try to cut it open this weekend and the result was a complex circuit for my understanding. I'm post it here if someone is interested to see or explain how it works. So I ended ...
emirjonb's user avatar
1 vote

LED headlight set?

As has been pointed out the fitting of leds is not an issue; they fit and electricity use is lower. What is a problem in some countries is that led lights are required to have an automatic headlight ...
Solar Mike's user avatar
  • 34.6k
1 vote

LED headlight set?

Replacing halogen bulbs with LEDs will not have a negative effect on the electrical system. Some cars have a lamp testing system that will alert you if the bulb isn't drawing the correct power (...
David Sain's user avatar
1 vote

12V relay circuit not working

you wired your relay wrong. see pic.
dtm's user avatar
  • 11
1 vote

Push button when LED comes on

It may require some experimentation to get it right, but perhaps a small reed relay will do what you want. Connect the coil in series with the LED, and connect the contacts in parallel with the switch....
Dave Tweed's user avatar
1 vote

Can I use a Jump Starter Battery Pack to directly power LED spotlights on a motorbike?

Absolutely. A few caveats. Ensure the lights you are powering are 12v ready (assuming the jumper pack is 12v as well). Then you just need to worry about two things. First, where to safely house/...
Pᴀᴜʟsᴛᴇʀ2's user avatar
1 vote
Accepted

Mixing LED and regular light bulbs

You can use a mix of both yes. Just remember that if they are for indicators to either add inline resistors to the led bulbs as these draw much less energy than the incandescent bulbs and will flash ...
DamoC's user avatar
  • 421
1 vote

Addtional LED lightstrips for cars

If you want them "always on", why would you connect the new strips to the headlight/DRL circuits at all? Just connect them directly to the switched 12V accessory bus, through a fuse.
Dave Tweed's user avatar

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