I bought these to replace my blue Whelen Vertex lights as my car is no longer used for patrol. They were identical to the Whelen Vertex system so installation was easy. The built-in module was slightly larger on the Abrams, but that wasn't a problem as there was plenty of room behind the taillight. The only thing I could notice as a big difference was the color cast of the light output. The Whelen lights had a slightly bluish tint that made the light more hyper-white. The Abrams had a more natural white light but just as bright. If you already have a Whelen system installed and are just replacing a light or expanding an existing system I would suggest sticking with the Whelen to keep the color rendering the same. On the other hand, if you need a budget option then this is the way to go. So far I haven't had any problems with these
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