Whelen Liberty- when & what types of diodes over the years?

Curious to learn more on the types of LED diodes used in the Liberty lightbar over the years... I know that the diodes changed at some point in 2008 and 2010 so at least 3 different types were used in, say a typical LIN6 head. Does anyone have full clarity on the month/year they changed diodes and what type they were?? Thanks
 

shues

Lifetime VIP Supporter
@wilsonbr90 is the resident expert. I imagine he'll be along shortly, but in the meantime here's this:

Whelen switched through differect manufactures of leds through their progression.

Early leds were philips lumileds which were one of the first cost effective high output led on the market. These started off as the dreaded teal blue that everyone hates.

Lending to feedback philips progressed and improved the led design to have more output and be more reliable. This in turn changed the color to a more pleasent blue.

Second generation of leds that whelen used were cree xr-e. This was one of the first high output surface mount leds. This allowed the light manufacture to flow solder every part of the board. These early ones were a mixture between blues, leading more to the light blue side of things. Although better than the teal blue, it still wasn't as pleasing as the nice deep blue.

Cree progressed their leds to more output and better longevity ending in the cree xr-c and as a result a better blue was attained.

Third generation was leant to making the light heads smaller. This is where we are currently at. Depending on model depends on leds. The first round was the cree xp-e. Variations of blue exist but whelen generally used the same blue.

Second round is the philips luxeon rebel. The most commonly used led now for most major manufactures. This is also available in multiple hues of blue including true blue and royal blue.

So you can't blame it on the light manufacturers as much as you can the led companies. They are continually updating their designs and therefore changing what's available to the manufacturers. It's a race to see who can push the most lumens in the smallest amount of space.
 

dmathieu

Premium Member
I know that in late 2011 Whelen changed their amber LED, creating a nicer color, and appx. 3X the output. HUUUGE difference!!
 

Nolines

Silver Supporter
and still none of the reliability ! actually what was the change... thinking back and looking at my own led's I dont see the difference...
 

dmathieu

Premium Member
Get a pre late 2011, and a post late 2011, you'll see. Google it, and there is a thread on here.
 

Nolines

Silver Supporter
i have both on my car cause i had to replace 2 vertex when the diodes went, and since I hadnt had them before I bought my car in 2007 they lasted 11 12 years and replaced them last year or so but i dont see a difference between the 2 that were still working and the 2 new... but ill look on google for it
 

Nolines

Silver Supporter
read the thread, someone commented they switched to cree from rebel so its a good question which is which... I know lets ask Wilson!
 

wilsonbr90

Wilson LED
the bright yellow was a model change but didn't last long. it was predominately used on the rebel model of leds, but there were a few cree xp in there in there that were yellow too.

models of leds used in libby 1 and libby 2 are;
lumileds, cree xr, cree xp, luxeon rebels, and cree xq

whelen switched off from rebel leds after a few year due to high failure rate from a manufacturing defect where the die and the substrate would dis attach itself. cree xp series is the most tolerant to abuse.
 
the bright yellow was a model change but didn't last long. it was predominately used on the rebel model of leds, but there were a few cree xp in there in there that were yellow too.

models of leds used in libby 1 and libby 2 are;
lumileds, cree xr, cree xp, luxeon rebels, and cree xq

whelen switched off from rebel leds after a few year due to high failure rate from a manufacturing defect where the die and the substrate would dis attach itself. cree xp series is the most tolerant to abuse.
So whelen isn’t using the super-bright yellow anymore?
 

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