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  #13  
Old 10-14-2013, 11:05 AM
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Only the outer ring of the taillight is LED.
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Old 10-14-2013, 06:19 PM
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Re: LED tails...really?

I prefer that anyway. I don't like how led lights have a bunch of small lights compared to the regular bulb which is just one big spot of light.
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Old 10-14-2013, 07:39 PM
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You can't just buy LED bulbs like I can do for a light in my house?
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  #16  
Old 10-14-2013, 07:44 PM
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Re: LED tails...really?

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Originally Posted by JC_0105 View Post
You can't just buy LED bulbs like I can do for a light in my house?
lol I wish it was that easy
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  #17  
Old 10-14-2013, 07:52 PM
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Re: LED tails...really?

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Originally Posted by tony4311 View Post
I prefer that anyway. I don't like how led lights have a bunch of small lights compared to the regular bulb which is just one big spot of light.
A lot of new cars use LED tails that aren't a bunch of individual lights. Kinda like the outer ring on the GC tails.
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Old 10-14-2013, 07:55 PM
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Re: LED tails...really?

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Originally Posted by 2014 LAREDO View Post
Mine are not. I'm glad, led is kinda disco.
Check again. Turn on your parking lights and walk to the back of your Jeep. You should see a ring of light that is illuminated by LEDs.
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  #19  
Old 10-14-2013, 07:56 PM
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Re: LED tails...really?

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Originally Posted by JC_0105 View Post
You can't just buy LED bulbs like I can do for a light in my house?
Yes and no...

You can buy a LED bulb, but you also need to install a resistor on each light.

The car computer has a function that checks the power use for each bulb. If the power drops too low (i.e. blown bulb, no power use) then you get a warning on the console display and you get a fast blink for your turn signals. As you probably know, LEDs use less power than bulbs. So, to avoid the bulb out problems, you need a resistor to increase the power being used at the same level as a bulb.

It's too bad you can't turn off the bulb-out feature. If you could, you could do a direct replacement.

As for the lens in the hatch, there is a mounting hole for a bulb holder, it's just plugged and has no wires going to it. Putting a bulb in it might be one of my projects for next summer.
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  #20  
Old 10-14-2013, 08:39 PM
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Re: LED tails...really?

I always replace my incandescent bulbs with LED's. Too easy. I love the crisp on/off of LED's, not the very soft pulsing of incandescents. Something about an old bulb type that puts out 90% of its energy as heat instead of light drives me crazy.
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Old 10-14-2013, 09:06 PM
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Quote:
Originally Posted by David_Hart View Post
Yes and no... You can buy a LED bulb, but you also need to install a resistor on each light. The car computer has a function that checks the power use for each bulb. If the power drops too low (i.e. blown bulb, no power use) then you get a warning on the console display and you get a fast blink for your turn signals. As you probably know, LEDs use less power than bulbs. So, to avoid the bulb out problems, you need a resistor to increase the power being used at the same level as a bulb.
Well...not quite. The purpose of the resistor is current LIMITING...not to increase the power being used.

Incandescent bulbs are resistive elements. You're getting light out of them because the current moving through the filiment heats it -- causing it to glow incandescently. As it heats, it's resistance grows, giving you a nice current limited solution. However, the constant heating and cooling causes material fatigue, which is why these bulbs eventually fail.

LEDs on the other hand are semiconductor devices. They don't really have a "resistance" per se. Current through them will rise exponentially as voltage is increased -- it's not really a linear function like with a resistive element. Anyway, LEDs are rated to have a maximum brightness at a given current--above that current, no real increase in brightness occurs; you're just wasting it. In addition, as you increase that current, the LED junction heats. So, just dumping current into an LED unchecked can cause junction breakdown and premature failure. The resistor used with LEDs is sized to provide a specific voltage drop given the driving source, and therefore limiting the current to the desired amount.

The calculation isn't entirely straightforward because of the way LEDs work. You really need to know the forward voltage and current of the LED -- the manufacturer usually specifies the forward current and voltage at a specific brightness up to max -- and then use that to figure the size of your limiting resistor.
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  #22  
Old 10-15-2013, 12:28 AM
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Re: LED tails...really?

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Originally Posted by Marlon_JB2 View Post
I've asked why this was done. The only answer that I was given that it was cooler to have the LED portion of the taillamps exclusively kinda follow the design of the headlamps. Best I can do.

I haven't heard one person say that it was done to cut costs.
Thanks Marlon, but most of us know the real reason was cost. Many economy cars out there have the same cheap setup that the WK2's have. On them I can understand why. But the more expensive cars have full LED taillights. And for what a Summit or SRT cost, they should of at least had full LED's in back.
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  #23  
Old 10-15-2013, 12:39 AM
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Re: LED tails...really?

LEDs stay cool so snow will cover the lights. not good.
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  #24  
Old 10-15-2013, 09:17 AM
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Re: LED tails...really?

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Originally Posted by David_Hart View Post
Yes and no...

....As for the lens in the hatch, there is a mounting hole for a bulb holder, it's just plugged and has no wires going to it. Putting a bulb in it might be one of my projects for next summer.
I would be interested to see how that looks if you get around to it.
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